SPARQL 1.2 Update

Abstract

This document describes SPARQL 1.2 Update, an update language for RDF graphs. It uses a syntax derived from the SPARQL Query Language for RDF. Update operations are performed on a collection of graphs in a Graph Store. Operations are provided to update, create, and remove RDF graphs in a Graph Store.

SPARQL 1.2 Update supports two categories of update operations on a Graph Store:

Graph Update — addition and removal of triples from some graphs within the Graph Store.
Graph Management — creating and deletion of graphs within the Graph Store, as well as convenient shortcuts for graph update operations often used during graph management (to add, move, and copy graphs).

A request is a sequence of operations and is terminated by EOF (End of File). Multiple operations are separated by a ';' (semicolon) character. A semicolon after the last operation in a request is optional. Implementations MUST ensure that the operations of a single request are executed in a fashion that guarantees the same effects as executing them sequentially in the order they appear in the request.

Operations all result either in success or failure. A failure result MAY be accompanied by extra information, indicating that some portion of the operations in the request were successful. This document does not stipulate the exact form of the result, as that will be dependent on the interface being used, for instance the SPARQL 1.2 Protocol via HTTP or a programmatic API. If multiple operations are present in a single request, then a result of failure from any operation MUST abort the sequence of operations, causing the subsequent operations to be ignored.

The formal semantics of the following operations is defined in Section 4 of this document.

Graph update operations change existing graphs in the Graph Store but do not explicitly delete nor create them. Non-empty inserts into non-existing graphs will, however, implicitly create those graphs, i.e., an implementation fulfilling an update request SHOULD silently an automatically create graphs that do not exist before triples are inserted into them, and MUST return with failure if it fails to do so for any reason. (For example, the implementation may have insufficient resources, or an implementation may only provide an update service over a fixed set of graphs and the implicitly created graph is not within this fixed set). An implementation MAY remove graphs that are left empty after triples are removed from them.

If a graph is created implicitly by an update operation, then the behavior of the Graph Store MUST be functionally equivalent to its behavior if the graph had been created explicitly by a CREATE operation.

SPARQL 1.2 Update provides these graph update operations:

The INSERT DATA operation adds some triples, given inline in the request, into a graph. This SHOULD create the destination graph if it does not exist. If the graph does not exist and it can not be created for any reason, then a failure MUST be returned.
The DELETE DATA operation removes some triples, given inline in the request, if the respective graph contains those.
The fundamental pattern-based actions for graph updates are INSERT and DELETE (which can co-occur in a single DELETE/INSERT operation). These actions consist of groups of triples to be deleted and groups of triples to be added. The specification of the triples is based on query patterns. The difference between INSERT / DELETE and INSERT DATA / DELETE DATA is that INSERT DATA and DELETE DATA do not substitute bindings into a template from a pattern. The DATA forms require concrete data (triple templates containing variables within DELETE DATA and INSERT DATA operations are disallowed and blank nodes are disallowed within DELETE DATA, see Notes 8+9 in the grammar). Having specific operations for concrete data means that a request can be streamed so that large, pure-data updates can be done.
The LOAD operation reads the contents of a document representing a graph into a graph in the Graph Store.
The CLEAR operation removes all the triples in (one or more) graphs.

The INSERT DATA operation adds some triples, given inline in the request, into the Graph Store:

INSERT DATA  QuadData

where QuadData are formed by TriplesTemplates, i.e., sets of triple patterns, optionally wrapped into a GRAPH block.

( GRAPH  VarOrIri )? { TriplesTemplate? }

Variables in QuadDatas are disallowed in INSERT DATA requests (see Notes 8 in the grammar). That is, the INSERT DATA statement only allows to insert ground triples. Blank nodes in QuadDatas are assumed to be disjoint from the blank nodes in the Graph Store, i.e., will be inserted with "fresh" blank nodes.

If no graph is described in the QuadData, then the default graph is presumed. If data is inserted into a graph that does not exist in the Graph Store, it SHOULD be created (there may be implementations providing an update service over a fixed set of graphs which in such case MUST return with failure for update requests that insert data into an unallowed graph).

Note that a triple MAY be considered to be "processed" with no action if that triple already exists in the graph. Further, note that

INSERT DATA { GRAPH <g> {} } ...

does not create <g>. If a user intends to just create a graph, then the graph management operations (CREATE/LOAD) may be used prior to any insertion operations.

Example 1: Adding some triples to a graph

This snippet describes two RDF triples to be inserted into the default graph of the Graph Store.

PREFIX dc: <http://purl.org/dc/elements/1.1/>
INSERT DATA
{
  <http://example/book1> dc:title "A new book" ;
                         dc:creator "A.N.Other" .
}

Data before:

# Default graph
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX ns: <http://example.org/ns#>

<http://example/book1> ns:price 42 .

Data after:

# Default graph
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX ns: <http://example.org/ns#>

<http://example/book1> ns:price 42 .
<http://example/book1> dc:title "A new book" .
<http://example/book1> dc:creator "A.N.Other" .

Example 2: Adding a triple to a named graph

This SPARQL 1.2 Update request adds a triple to provide the price of a book. In contrast to the previous example, which affected the default graph, the requested change happens in the named graph identified by the IRI http://example/bookStore.

PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX ns: <http://example.org/ns#>
INSERT DATA
{ GRAPH <http://example/bookStore> { <http://example/book1>  ns:price  42 } }

Data before:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
<http://example/book1> dc:title "Fundamentals of Compiler Design" .

Data after:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX ns: <http://example.org/ns#>
<http://example/book1> dc:title "Fundamentals of Compiler Design" .
<http://example/book1> ns:price 42 .

Example 3: Adding a reified triple

When inserting triples containing reified triples, these reified triples are not automatically inserted as asserted triples. In other words, when executing the INSERT DATA operation below, the default graph will not contain the triple :bob :age 23.

PREFIX : <http://www.example.org/>
INSERT DATA
{ :alice :claims << :bob :age 23 >> . }

Data before is the empty graph.

Data after:

PREFIX : <http://www.example.org/>
:alice :claims << :bob :age 23 >> .

If a reified triple is to be present as an asserted triple, then it needs to be explicitly inserted, through an operation like the following INSERT DATA.

PREFIX : <http://www.example.org/>
INSERT DATA
{
  :alice :claims << :bob :age 23 >>.
  :bob :age 23.
}

Data after:

PREFIX : <http://www.example.org/>
:alice :claims << :bob :age 23 >> .
:bob :age 23 .

The DELETE DATA operation removes some triples, given inline in the request, if the respective graphs in the Graph Store contain those:

DELETE DATA  QuadData

QuadData denotes triples to be removed and is as described in INSERT DATA, with the difference that in a DELETE DATA operation neither variables nor blank nodes are allowed (see Notes 8+9 in the grammar).

As with INSERT DATA, DELETE DATA is meant for deletion of ground triples data which is why QuadData that contains variables or blank nodes is disallowed in DELETE DATA operations. The DELETE/INSERT operation can be used to remove triples containing blank nodes.

Note that the deletion of non-existing triples has no effect, i.e., triples in the QuadData that did not exist in the Graph Store are ignored. Blank nodes are not permitted in the QuadData, as these do not match any existing data.

Example 4: Removing triples from a graph

This request describes 2 triples to be removed from the default graph of the Graph Store.

PREFIX dc: <http://purl.org/dc/elements/1.1/>

DELETE DATA
{
  <http://example/book2> dc:title "David Copperfield" ;
                         dc:creator "Edmund Wells" .
}

Data before:

# Default graph
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX ns: <http://example.org/ns#>

<http://example/book2> ns:price 42 .
<http://example/book2> dc:title "David Copperfield" .
<http://example/book2> dc:creator "Edmund Wells" .

Data after:

# Default graph
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX ns: <http://example.org/ns#>

<http://example/book2> ns:price 42 .

Example 5: Removing a triple from a named graph

This SPARQL 1.2 Update request consists of two operations, including a triple to be deleted and a triple to be added (used here to correct a book title). As opposed to the previous example, which affected the default graph, the requested change happens in the named graph identified by the IRI http://example/bookStore.

PREFIX dc: <http://purl.org/dc/elements/1.1/>
DELETE DATA
{ GRAPH <http://example/bookStore> { <http://example/book1>  dc:title  "Fundamentals of Compiler Desing" } } ;

PREFIX dc: <http://purl.org/dc/elements/1.1/>
INSERT DATA
{ GRAPH <http://example/bookStore> { <http://example/book1>  dc:title  "Fundamentals of Compiler Design" } }

Data before:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
<http://example/book1> dc:title "Fundamentals of Compiler Desing" .

Data after:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
<http://example/book1> dc:title "Fundamentals of Compiler Design" .

Example 6: Removing a reified triple

When deleting triples containing reified triples, these reified triples are not automatically deleted as asserted triples. In other words, when executing the DELETE DATA operation below, the default graph will still contain the triple :bob :age 23 if it was previously present as an asserted triple.

PREFIX : <http://www.example.org/>
DELETE DATA
{
  :alice :claims << :bob :age 23 >>.
}

Data before:

PREFIX : <http://www.example.org/>
:alice :claims << :bob :age 23 >> .
:bob :age 23 .

Data after:

PREFIX : <http://www.example.org/>
:bob :age 23 .

In contrast, deleting an asserted triple with the request shown below would not delete any triple containing this triple as a reified triple.

PREFIX : <http://www.example.org/>
DELETE DATA
{
  :bob :age 23 .
}

The DELETE/INSERT operation can be used to remove or add triples from/to the Graph Store based on bindings for a query pattern specified in a WHERE clause:

( WITH IRIref )?
( ( DeleteClause InsertClause? ) | InsertClause )
( USING ( NAMED )? IRIref )*
WHERE GroupGraphPattern

The DeleteClause and InsertClause forms can be broken down as follows:

DeleteClause ::= DELETE  QuadPattern
InsertClause ::= INSERT  QuadPattern

This operation identifies data with the WHERE clause, which will be used to compute solution sequences of bindings for a set of variables. The bindings for each solution are then substituted into the DELETE template to remove triples, and then in the INSERT template to create new triples. If any solution produces a triple containing an unbound variable or an illegal RDF construct, such as a literal in a subject or predicate position, then that triple is not included when processing the operation: INSERT will not instantiate new data in the output graph, and DELETE will not remove anything. The graphs used for computing a solution sequence may be different to the graphs modified with the DELETE and INSERT templates.

The WITH clause defines the graph that will be modified or matched against for any of the subsequent elements (in DELETE, INSERT, or WHERE clauses) if they do not specify a graph explicitly. If not provided, then the default graph of the Graph Store (or an explicitly declared dataset in the WHERE clause) will be assumed. That is, a WITH clause may be viewed as syntactic sugar for wrapping both the QuadPatterns in subsequent DELETE and INSERT clauses, and likewise the GroupGraphPattern in the subsequent WHERE clause into GRAPH patterns. This can be used to avoid refering to the same graph multiple times in a single operation.

Following the optional WITH clause are the INSERT and/or DELETE clauses. The deletion of the triples happens before the insertion. The pattern in the WHERE clause is evaluated only once, before the delete part of the operation is performed. The overall processing model is that the pattern is executed, the results used to instantiate the DELETE template, the deletes performed, the results used again to instantiate the INSERT template, and the inserts performed.

If the DELETE clause is omitted, then the operation only inserts data (see INSERT). If the INSERT clause is omitted, then the operation only removes data (see DELETE). The grammar does not permit both DELETE and INSERT to be omitted in the same operation.

The USING and USING NAMED clauses affect the RDF Dataset used while evaluating the WHERE clause. This describes a dataset in the same way as FROM and FROM NAMED clauses describe RDF Datasets in the SPARQL 1.2 Query Language. The keyword USING instead of FROM in update requests is to avoid possible ambiguities which could arise from writing "DELETE FROM". That is, the GroupGraphPattern in the WHERE clause will be matched against the dataset described by explicit USING or USING NAMED clauses, if specified, and against the Graph Store otherwise.

The WITH clause provides a convenience for when an operation primarily refers to a single graph. If a graph name is specified in a WITH clause, then — for the purposes of evaluating the WHERE clause — this will define an RDF Dataset containing a default graph with the specified name, but only in the absence of USING or USING NAMED clauses. In the presence of one or more graphs referred to in USING clauses and/or USING NAMED clauses, the WITH clause will be ignored while evaluating the WHERE clause.

The GroupGraphPattern in the WHERE clause is evaluated as in a SPARQL query "SELECT * WHERE GroupGraphPattern" and all the solution bindings are applied to the preceding DELETE and INSERT templates for defining the triples to be deleted from or inserted into the Graph Store.

Again, QuadPatterns are formed by TriplesTemplates, i.e., sets of triple patterns, optionally wrapped into a GRAPH block, where the GRAPH clause indicates the named graph in the Graph Store to be updated; on any TripleTemplates without a GRAPH clause, the INSERT or DELETE clauses applies to the graph specified by the WITH clause, or the default graph of the Graph Store if no WITH clause is present.

To illustrate the use of the WITH clause, an operation of the general form:

WITH <g1> DELETE { a b c } INSERT { x y z } WHERE { ... }

is considered equivalent to:

DELETE { GRAPH <g1> { a b c } } INSERT { GRAPH <g1> { x y z } } USING <g1> WHERE { ... }

Note that explicit GRAPH clauses override a WITH clause. WITH provides a fallback to specify a graph (different from the default graph) to use when one is not explicitly stipulated via GRAPH.

Deleting triples that are not present, or from a graph that is not present will have no effect and will result in success. Blank nodes are prohibited in a DELETE template, since using a new blank node in a DELETE template would lead to nothing being deleted, as a new blank node cannot match anything in the Graph Store. It should be noted that this restriction is not in the EBNF for the DeleteClause itself, but made explicit in Note 9 to the grammar.

If an operation tries to insert into a graph that does not exist, then that graph SHOULD be created; again, there may be implementations providing an update service over a fixed set of graphs which in such case MUST return with failure for update requests that would create an unallowed graph. If no data is to be inserted, then no graph will be created. Particularly, note that

INSERT ... { GRAPH <g> {} } ...

does not create <g>. If a user intends to create a graph regardless of the data to be inserted, then the graph management operations (CREATE/LOAD) may be used prior to any insertion operations.

Blank nodes that appear in an INSERT clause operate similarly to blank nodes in the template of a CONSTRUCT query, i.e., they are re-instantiated for any solution of the WHERE clause; refer to Templates with Blank Nodes in SPARQL Query 1.2 and to the formal semantics of DELETE/INSERT below for details. Blank nodes in the WHERE clause match data in the same way as for any SPARQL Query.

Example 7: Updating a named graph

An example to update the graph http://example/addresses to rename all people with the given name "Bill" to "William".

PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

WITH <http://example/addresses>
DELETE { ?person foaf:givenName 'Bill' }
INSERT { ?person foaf:givenName 'William' }
WHERE
  { ?person foaf:givenName 'Bill'
  }

Data before:

# Graph: http://example/addresses
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/president25> foaf:givenName "Bill" .
<http://example/president25> foaf:familyName "McKinley" .
<http://example/president27> foaf:givenName "Bill" .
<http://example/president27> foaf:familyName "Taft" .
<http://example/president42> foaf:givenName "Bill" .
<http://example/president42> foaf:familyName "Clinton" .

Data after:

# Graph: http://example/addresses
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/president25> foaf:givenName "William" .
<http://example/president25> foaf:familyName "McKinley" .
<http://example/president27> foaf:givenName "William" .
<http://example/president27> foaf:familyName "Taft" .
<http://example/president42> foaf:givenName "William" .
<http://example/president42> foaf:familyName "Clinton" .

Example 8: Updating reified triples

Just like with the INSERT DATA and DELETE DATA operations, inserting or deleting triples containing reified triples does not automatically impact asserted triples. It is still possible to impact such triples by explicitly asserting them, as shown below.

PREFIX :  <http://www.example.org/>

DELETE { :alice ?pp << ?s ?p ?o >> . }
INSERT { :carol ?pp << ?s ?p ?o >> .  ?s ?p ?o .}
WHERE {  :alice ?pp << ?s ?p ?o >> . }

( WITH  IRIref )?
DELETE  QuadPattern
( USING ( NAMED )? IRIref )*
WHERE GroupGraphPattern

The DELETE operation is a form of the DELETE/INSERT operation having no INSERT section. A compliant implementation of DELETE/INSERT will already implement this operation correctly. The DELETE operation is described here separately for clarity. Analogous to DELETE/INSERT, deleting triples that are not present, or from a graph that is not present will have no effect and will result in success.

If any DELETE template specifies a GRAPH then this will be the graph affected. Otherwise, the operation will be applied to the graph specified in the WITH clause, if one was specified, or the default graph otherwise.

The WHERE clause identifies data in existing graphs, and creates bindings to be used by the template. The graphs to apply the GroupGraphPattern follow the same rules as for DELETE/INSERT.

Example 9:

This example request deletes all records of old books (with date before year 1970) from the store's default graph:

PREFIX dc:  <http://purl.org/dc/elements/1.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

DELETE
 { ?book ?p ?v }
WHERE
 { ?book dc:date ?date .
   FILTER ( ?date < "1970-01-01T00:00:00-02:00"^^xsd:dateTime )
   ?book ?p ?v
 }

The pattern in WHERE is matched against the Graph Store. The resulting sequence of solutions to the WHERE clause is used to instantiate the triple patterns in the DELETE template similar to CONSTRUCT in SPARQL 1.2 Query. The resulting triples are then removed from the Graph Store.

Data before:

# Default graph
PREFIX dc: <http://purl.org/dc/elements/1.1/>

<http://example/book1> dc:title "Principles of Compiler Design" .
<http://example/book1> dc:date "1977-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book2> ns:price 42 .
<http://example/book2> dc:title "David Copperfield" .
<http://example/book2> dc:creator "Edmund Wells" .
<http://example/book2> dc:date "1948-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book3> dc:title "SPARQL 1.2 Tutorial" .

Data after:

# Default graph
PREFIX dc: <http://purl.org/dc/elements/1.1/>

<http://example/book2> ns:price 42 .
<http://example/book2> dc:title "David Copperfield" .
<http://example/book2> dc:creator "Edmund Wells" .
<http://example/book2> dc:date "1948-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book3> dc:title "SPARQL 1.2 Tutorial" .

Example 10:

This example request removes all statements about anything with a given name of "Fred" from the graph http://example/addresses. A WITH clause is present, meaning that graph http://example/addresses is both the one from which triples are being removed and the one which the WHERE clause is matched against.

PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

WITH <http://example/addresses>
DELETE { ?person ?property ?value }
WHERE { ?person ?property ?value ; foaf:givenName 'Fred' }

Data before:

# Graph: http://example/addresses
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox <mailto:bill@example> .

<http://example/fred> a foaf:Person .
<http://example/fred> foaf:givenName "Fred" .
<http://example/fred> foaf:mbox  <mailto:fred@example> .

Data after:

# Graph: http://example/addresses
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

Another example of DELETE is provided in the final example in the following section which demonstrates multiple operations combining an INSERT with a DELETE.

( WITH IRIref )?
INSERT  QuadPattern
( USING ( NAMED )?  IRIref )*
WHERE GroupGraphPattern

The INSERT operation is a form of the DELETE/INSERT operation having no DELETE section. A compliant implementation of DELETE/INSERT will already implement this operation correctly. The INSERT operation is described here separately for clarity.

If the INSERT template specifies GRAPH blocks then these will be the graphs affected. Otherwise, the operation will be applied to the default graph, or, respectively, to the graph specified in the WITH clause, if one was specified. If no USING (NAMED) clause is present, then the pattern in the WHERE clause will be matched against the Graph Store, otherwise against the dataset specified by the USING (NAMED) clauses. The matches against the WHERE clause create bindings to be applied to the template for determining triples to be inserted (following the same rules as for DELETE/INSERT).

If any instantiation arising from the solution sequence produces a triple containing an unbound variable or an illegal RDF construct, such as a literal in subject or predicate position, then that triple is not inserted. The template can contain triples with no variables (known as ground or explicit triples), and these will also be inserted, provided that the solution sequence is not empty.

Example 11:

This example copies triples from one named graph to another named graph based on a pattern:

PREFIX dc:  <http://purl.org/dc/elements/1.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

INSERT
  { GRAPH <http://example/bookStore2> { ?book ?p ?v } }
WHERE
  { GRAPH  <http://example/bookStore>
       { ?book dc:date ?date .
         FILTER ( ?date > "1970-01-01T00:00:00-02:00"^^xsd:dateTime )
         ?book ?p ?v
  } }

Data before:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

<http://example/book1> dc:title "Fundamentals of Compiler Design" .
<http://example/book1> dc:date "1977-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book2> ns:price 42 .
<http://example/book2> dc:title "David Copperfield" .
<http://example/book2> dc:creator "Edmund Wells" .
<http://example/book2> dc:date "1948-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book3> dc:title "SPARQL 1.2 Tutorial" .

# Graph: http://example/bookStore2
PREFIX dc: <http://purl.org/dc/elements/1.1/>

<http://example/book4> dc:title "SPARQL 1.0 Tutorial" .

Data after:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

<http://example/book1> dc:title "Fundamentals of Compiler Design" .
<http://example/book1> dc:date "1977-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book2> ns:price 42 .
<http://example/book2> dc:title "David Copperfield" .
<http://example/book2> dc:creator "Edmund Wells" .
<http://example/book2> dc:date "1948-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book3> dc:title "SPARQL 1.2 Tutorial" .

# Graph: http://example/bookStore2
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

<http://example/book1> dc:title "Fundamentals of Compiler Design" .
<http://example/book1> dc:date "1977-01-01T00:00:00-02:00"^^xsd:dateTime .

<http://example/book4> dc:title "SPARQL 1.0 Tutorial" .

Example 12:

This example copies triples of name and email from one named graph to another. Some individuals may not have an address, but the name is copied regardless:

PREFIX foaf:  <http://xmlns.com/foaf/0.1/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

INSERT
  { GRAPH <http://example/addresses>
    {
      ?person  foaf:name  ?name .
      ?person  foaf:mbox  ?email
    } }
WHERE
  { GRAPH  <http://example/people>
    {
      ?person  foaf:name  ?name .
      OPTIONAL { ?person  foaf:mbox  ?email }
    } }

Data before:

# Graph: http://example/people
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf:  >http://www.w3.org/1999/02/22-rdf-syntax-ns#>

_:a  rdf:type        foaf:Person .
_:a  foaf:name       "Alice" .
_:a  foaf:mbox       <mailto:alice@example.com> .

_:b  rdf:type        foaf:Person .
_:b  foaf:name       "Bob" .

# Graph: http://example/addresses
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

Data after:

# Graph: http://example/people
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX rdf:  >http://www.w3.org/1999/02/22-rdf-syntax-ns#>

_:a  rdf:type        foaf:Person .
_:a  foaf:name       "Alice" .
_:a  foaf:mbox       <mailto:alice@example.com> .

_:b  rdf:type        foaf:Person .
_:b  foaf:name       "Bob" .

# Graph: http://example/addresses
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

_:a  foaf:name       "Alice" .
_:a  foaf:mbox       <mailto:alice@example.com> .

_:b  foaf:name       "Bob" .

Example 13:

This example request first copies triples from one named graph to another named graph based on a pattern; triples about all the copied objects that are classified as Physical Objects are then deleted. This demonstrates two operations in a single request, both of which share common PREFIX definitions.

PREFIX dc:  <http://purl.org/dc/elements/1.1/>
PREFIX dcmitype: <http://purl.org/dc/dcmitype/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

INSERT
  { GRAPH <http://example/bookStore2> { ?book ?p ?v } }
WHERE
  { GRAPH  <http://example/bookStore>
     { ?book dc:date ?date .
       FILTER ( ?date < "2000-01-01T00:00:00-02:00"^^xsd:dateTime )
       ?book ?p ?v
     }
  } ;

WITH <http://example/bookStore>
DELETE
 { ?book ?p ?v }
WHERE
 { ?book dc:date ?date ;
         dc:type dcmitype:PhysicalObject .
   FILTER ( ?date < "2000-01-01T00:00:00-02:00"^^xsd:dateTime )
   ?book ?p ?v
 }

Data before:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX dcmitype: <http://purl.org/dc/dcmitype/>

<http://example/book1> dc:title "Fundamentals of Compiler Design" .
<http://example/book1> dc:date "1996-01-01T00:00:00-02:00"^^xsd:dateTime .
<http://example/book1> a dcmitype:PhysicalObject .

<http://example/book3> dc:title "SPARQL 1.2 Tutorial" .

# Graph: http://example/bookStore2
PREFIX dc: <http://purl.org/dc/elements/1.1/>

<http://example/book4> dc:title "SPARQL 1.0 Tutorial" .

Data after:

# Graph: http://example/bookStore
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX dcmitype: <http://purl.org/dc/dcmitype/>

<http://example/book3> dc:title "SPARQL 1.2 Tutorial" .

# Graph: http://example/bookStore2
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX dcmitype: <http://purl.org/dc/dcmitype/>

<http://example/book1> dc:title "Fundamentals of Compiler Design" .
<http://example/book1> dc:date "1996-01-01T00:00:00-02:00"^^xsd:dateTime .
<http://example/book1> a dcmitype:PhysicalObject .

<http://example/book4> dc:title "SPARQL 1.0 Tutorial" .

DELETE WHERE  QuadPattern

The DELETE WHERE operation is a shortcut form for the DELETE/INSERT operation where bindings matched by the WHERE clause are used to define the triples in a graph that will be deleted. Analogous to DELETE/INSERT, deleting triples that are not present, or from a graph that is not present will have no effect and will result in success.

The QuadPattern is used both as a pattern for matching against triples and graphs, and as the template for deletion. If any TripleTemplates within the QuadPattern appear in the scope of a GRAPH clause then this will determine the graph that that template is matched on, and also the graph from which any matching triples will be removed. Any TripleTemplates not in the scope of a GRAPH clause will be matched against/removed from the default graph.

Example 14:

This example request removes all statements about anything with a given name of "Fred" from the default graph:

PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

DELETE WHERE { ?person foaf:givenName 'Fred';
                       ?property      ?value }

Data before:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

<http://example/fred> a foaf:Person .
<http://example/fred> foaf:givenName "Fred" .
<http://example/fred> foaf:mbox  <mailto:fred@example> .

Data after:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

Example 15:

This example request removes both statements naming some resource "Fred" in the graph http://example.com/names, and also statements about that resource from the graph http://example/addresses (assuming that some of the resources in the graph http://example.com/names have corresponding triples in the graph http://example/addresses).

PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

DELETE WHERE {
  GRAPH <http://example.com/names> {
    ?person foaf:givenName 'Fred' ;
            ?property1 ?value1
  }
  GRAPH <http://example.com/addresses> {
    ?person ?property2 ?value2
  }
}

# Graph: http://example.com/names
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .

<http://example/fred> a foaf:Person .
<http://example/fred> foaf:givenName "Fred" .

# Graph: http://example.com/addresses
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> foaf:mbox  <mailto:bill@example> .

<http://example/fred> foaf:mbox  <mailto:fred@example> .

Data after:

# Graph: http://example.com/names
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .

# Graph: http://example.com/addresses
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> foaf:mbox  <mailto:bill@example> .

The LOAD operation reads an RDF document from a IRI and inserts its triples into the specified graph in the Graph Store. The specified destination graph SHOULD be created if required; again, implementations providing an update service over a fixed set of graphs MUST return with failure for a request that would create a disallowed graph. If the destination graph already exists, then no data in that graph will be removed.

LOAD ( SILENT )? IRIref_from ( INTO GRAPH IRIref_to )?

IRIref_from specifies the IRI of a document such that a store will be able to identify, locate and read the document. The most common form will be URLs with the http IRI schemes. Once the document has been read, the resulting triples will be inserted into the destination graph named by the IRI referred to by IRIref_to.

If no destination graph IRI (IRIref_to) is provided to load the triples into, then the data will be loaded into the default graph.

In case no RDF data can be retrieved (as opposed to the empty graph being retrieved) from the IRI denoted by IRIref_from, or in case the retrieval method returns an error (such as, for instance an HTTP error code), the SPARQL 1.2 Update service SHOULD return failure and the status of the Graph Store SHOULD remain in the same status as prior to the request; in case the keyword SILENT is present, however, the operation will still return success and the status of the Graph Store is not specified by the present document: implementations may create the destination graph or not and partially load data, in case of a transmission error where partial data has been received (which itself may be legal RDF).

The CLEAR operation removes all the triples in the specified graph(s) in the Graph Store.

CLEAR  ( SILENT )? (GRAPH IRIref | DEFAULT | NAMED | ALL )

Here, the DEFAULT keyword is used to remove all triples in the default graph of the Graph Store, the NAMED keyword is used to remove all triples in all named graphs of the Graph Store and the ALL keyword is used to remove all triples in all graphs of the Graph Store. The GRAPH keyword is used to remove all triples from a graph denoted by IRIref. This operation is not required to remove the empty graphs from the Graph Store, but an implementation MAY decide to do so.

# Remove all triples from a specified graph.
CLEAR GRAPH IRIref

in principle has the same effect as:

# Remove all triples from the graph named with the IRI denoted by IRIref.
DELETE { GRAPH IRIref { ?s ?p ?o } } WHERE { GRAPH IRIref { ?s ?p ?o } }

Note

For services which form the default graph from the union of other graphs, CLEAR DEFAULT may have further implications which we leave unspecified here.

If the store records the existence of empty graphs, then the SPARQL 1.2 Update service, by default, SHOULD return failure if the specified graph does not exist. If SILENT is present, the result of the operation will always be success.

Stores that do not record empty graphs will always return success.

Graph management operations allow creating, destroying, moving and copying named graphs in the Graph Store, or adding the contents of one graph to another. Operations for creation and destruction are not required to result in any actions, since Graph Stores are not required to record the existence of empty named graphs.

The default graph in a Graph Store always exists.

SPARQL 1.2 Update provides these graph management operations:

The CREATE operation creates a new graph in stores that support empty graphs.
The DROP operation removes a graph and all of its contents.
The COPY operation modifies a graph to contain a copy of another.
The MOVE operation moves all of the data from one graph into another.
The ADD operation reproduces all data from one graph into another.

This operation creates a graph in the Graph Store:

CREATE ( SILENT )? GRAPH IRIref

For stores that record empty graphs, this will create a new empty graph in the store with a name specified by the IRI. If the graph already exists, then a failure SHOULD be returned, except when the SILENT keyword is used; in either case, the contents of already existing graphs remain unchanged. If the graph may not be created, then a failure MUST be returned, except when the SILENT keyword is used.

Stores that do not record empty named graphs will always return success on creation of a non-existing graph.

DROP ( SILENT )? (GRAPH IRIref | DEFAULT | NAMED | ALL )

The DROP operation removes the specified graph(s) from the Graph Store. The GRAPH keyword is used to remove a graph denoted by IRIref, the DEFAULT keyword is used to remove the default graph from the Graph Store, the NAMED keyword is used to remove all named graphs from the Graph Store, and the ALL keyword is used to remove all graphs from the Graph Store, i.e., resetting the store. After successful completion of this operation, the specified graphs are no longer available for further graph update operations. However, in case the DEFAULT graph of the Graph Store is dropped, implementations MUST restore it after it was removed, i.e., DROP DEFAULT is equivalent to CLEAR DEFAULT.

If the store records the existence of empty graphs, then the SPARQL 1.2 Update service, by default, SHOULD return failure if the specified named graph does not exist. If SILENT is present, the result of the operation will always be success.

Stores that do not record empty graphs will always return success.

The COPY operation is a shortcut for inserting all data from an input graph into a destination graph. Data from the input graph is not affected, but data from the destination graph, if any, is removed before insertion.

COPY ( SILENT )? ( ( GRAPH )? IRIref_from | DEFAULT) TO ( ( GRAPH )? IRIref_to | DEFAULT )

is similar in operation to:

DROP SILENT (GRAPH IRIref_to | DEFAULT);
      INSERT { ( GRAPH IRIref_to )? { ?s ?p ?o } } WHERE { ( GRAPH IRIref_from )? { ?s ?p ?o } }

The difference between COPY and the DROP/INSERT combination is that if COPY is used to copy a graph onto itself then no operation will be performed and the data will be left as it was. Using DROP/INSERT in this situation would result in an empty graph.

If the destination graph does not exist, it will be created. By default, the service MAY return failure if the input graph does not exist. If SILENT is present, the result of the operation will always be success.

Example 16:

This example request copies all statements from the default graph to a named graph:

COPY DEFAULT TO <http://example.org/named>

Data before:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

# Graph http://example.org/named
<http://example/fred> a foaf:Person .
<http://example/fred> foaf:givenName "Fred" .

Data after:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

# Graph http://example.org/named
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

Note that the original content in http://example.org/named is lost by a COPY operation.

The MOVE operation is a shortcut for moving all data from an input graph into a destination graph. The input graph is removed after insertion and data from the destination graph, if any, is removed before insertion.

MOVE (SILENT)? ( ( GRAPH )? IRIref_from | DEFAULT) TO ( ( GRAPH )? IRIref_to | DEFAULT)

is similar in operation to:

DROP SILENT (GRAPH IRIref_to | DEFAULT);
      INSERT { ( GRAPH IRIref_to )? { ?s ?p ?o } } WHERE { ( GRAPH IRIref_from )? { ?s ?p ?o } };
DROP ( GRAPH IRIref_from | DEFAULT)

The difference between MOVE and the DROP/INSERT/DROP combination is that if MOVE is used to move a graph onto itself then no operation will be performed and the data will be left as it was. Using DROP/INSERT/DROP in this situation would result in the graph being removed.

Example 17:

This example request moves all statements from the default graph into a named graph:

MOVE DEFAULT TO <http://example.org/named>

Data before:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

# Graph http://example.org/named
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/fred> a foaf:Person .
<http://example/fred> foaf:givenName "Fred" .

Data after:

# Default graph

# Graph http://example.org/named
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

Note that the original content in http://example.org/named is lost by a MOVE operation.

The ADD operation is a shortcut for inserting all data from an input graph into a destination graph. Data from the input graph is not affected, and initial data from the destination graph, if any, is kept intact.

ADD ( SILENT )? ( ( GRAPH )? IRIref_from | DEFAULT) TO ( ( GRAPH )? IRIref_to | DEFAULT)

is equivalent to:

INSERT { ( GRAPH IRIref_to )? { ?s ?p ?o } } WHERE { ( GRAPH IRIref_from )? { ?s ?p ?o } }

Example 18:

This example request adds all statements from the default graph to a named graph:

ADD DEFAULT TO <http://example.org/named>

Data before:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

# Graph http://example.org/named
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/fred> a foaf:Person .

Data after:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

# Graph http://example.org/named
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

<http://example/fred> a foaf:Person .

<http://example/william> a foaf:Person .
<http://example/william> foaf:givenName "William" .
<http://example/william> foaf:mbox  <mailto:bill@example> .

This section formally defines the semantics of Update Operations by describing their effects in terms of transformations of the Graph Store.

Definition: Graph Store

A Graph Store GS is a mutable container of RDF graphs. It has one unnamed (default) slot and zero or more named slots. The unnamed slot holds an RDF graph; each named slot is a pair of a graph and an associated IRI. The Graph Store can be viewed as a mutable RDF Dataset.

GS = {DG, (iri₁, G₁), ..., (iri_n, G_n) }

where

the default graph DG is the RDF graph associated with the unnamed slot
n ≥ 0 and for each 1 ≤ i ≤ n, G_i is an RDF graph associated with the named slot identified by IRI iri_i
all IRIs are distinct, i.e., i≠j implies iri_i≠iri_j

Note

We will use GS for the Graph Store, but sometimes also — synonymously — for the RDF Dataset corresponding to the current Graph Store content in subsequent definitions. For convenience, we will also sometimes write GS = {DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} as an alternative mathematical notation for GS = {DG, (iri₁, G₁), ..., (iri_n, G_n) } in subsequent definitions.

Definition: Update Operation

An Update Operation Op is an atomic operation that accepts some arguments Args and transforms a Graph Store GS to another Graph Store GS', denoted as

Op(GS, Args) = GS'

By 'atomic operation' we mean that the operation performs the described transformation of the Graph Store either completely or leaves the Graph Store unchanged, i.e., the result is either GS' or GS (in case of error).

An Update Operation can create new slots and new RDF graphs, or can remove existing slots and the corresponding graphs. It can also alter the state of each slot individually.

We will define the semantics of each concrete update operation in terms of concrete instances of this abstract update operation definition.

In the following we present auxiliary functions and basic operations for creating the union, and difference of RDF Datasets. The concrete update operations will be defined in terms of those basic operations.

Note

In the following definitions, we write 'union', 'intersect' and 'minus' to denote the respective set operations (union, intersection, and set difference).

This basic operation creates the union of two RDF Datasets.

Definition: Dataset-UNION

Let DS={DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} and DS' = {DG'} union {(iri'_j, G'_j) | 1 ≤ j ≤ m} be two RDF Datasets. Let further graphNames(DS) = { iri_i | 1 ≤ i ≤ n} and graphNames(DS') = {iri'_j | 1 ≤ j ≤ m}. The Dataset-UNION between DS and DS' is defined as follows:

Dataset-UNION(DS, DS') = {DG union DG'} union {(iri, G) | iri in graphNames(DS) union graphNames(DS')}

and G defined as

G_i for iri = iri_i such that iri_i in graphNames(DS) minus graphNames(DS')
G'_j for iri = iri'_j such that iri_j in graphNames(DS') minus graphNames(DS)
G_i union G'_j for iri = iri_i = iri'_j in graphNames(DS) intersect graphNames(DS')

where union between graphs is defined as set-union of triples in those graphs.

Note

In the following, whenever we write Dataset-UNION ( X ) where X = { DS₁, DS₂, ..., DS_n } is a set of datasets, we understand this as a shorthand for Dataset-UNION ( DS₁, Dataset-UNION ( DS₂, ..., Dataset-UNION ( DS_n, {} ) ... ) ).

This operation removes the triples of a given dataset from another dataset.

Definition: Dataset-DIFF

Let DS={DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} and DS' = {DG'} union {(iri'_j, G'_j) | 1 ≤ j ≤ m}) be two RDF Datasets. Let further graphNames(DS) = { iri_i | 1 ≤ i ≤ n} and graphNames(DS') = {iri'_j | 1 ≤ j ≤ m}. The Dataset-DIFF between DS and DS' is defined as follows:

Dataset-DIFF(DS, DS') = {DG minus DG'} union { (iri, G) | iri in graphNames(DS) })

and G defined as

G_i for iri = iri_i such that iri_i in graphNames(DS) minus graphNames(DS')
G_i minus G'_j for iri = iri_i = iri'_j in graphNames(DS) intersect graphNames(DS')

where G_i minus G'_j is defined as set-difference over the sets of triples in the two graphs.

The following auxiliary function constructs an RDF Dataset from a QuadPattern, given a solution mapping and an RDF Dataset.

Let μ be a solution mapping, DS={DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} be an RDF Dataset and GS be the current state of the Graph Store. DS is distinguished from GS as they may differ, for instance, due to the use of USING [NAMED] to modify DS.

For a QuadPattern of the form

'{}'

Dataset ( QuadPattern, μ, DS, GS ) = {{}}, i.e., the empty dataset consisting only of an empty default graph.
'{' TriplesTemplate? '}'

Dataset ( QuadPattern, μ, DS, GS ) is the Dataset consisting of only a default graph composed by all valid RDF triples obtained from substituting the variables in sk_μ(TriplesTemplate) according to μ and combining these triples into a single RDF graph by set union.
'GRAPH' VarOrIri '{' TriplesTemplate? '}'

Dataset ( QuadPattern, μ, DS, GS ) is the Dataset consisting of an empty default graph, plus — in case μ(VarOrIri) yields a valid IRI — a named graph (μ(VarOrIri), G) such that G is composed by all valid RDF triples obtained from substituting the variables in sk_μ(TriplesTemplate) according to μ and combining these triples into a single RDF graph by set union.
'{' QuadPattern1 QuadPattern2 '}'

Dataset ( QuadPattern, μ, DS, GS ) = Dataset-UNION ( Dataset ( QuadPattern1, μ, DS, GS ), Dataset ( QuadPattern2, μ, DS, GS ) )

Here, sk_μ(TriplesTemplate) stands for replacing any blank nodes occurring in the TriplesTemplate with a new, unique blank node (unique to the current update request and to each μ and different from any blank nodes used in DS or in GS).

The function sk_μ guarantees that "fresh" blank nodes in the QuadPattern are re-instantiated "per solution" μ (analogous to the treatment of blank nodes in CONSTRUCT templates in the SPARQL 1.2 Query Language); cf. also the respective remarks on scoping of blank nodes within requests in the SPARQL grammar.

The following auxiliary function constructs an RDF Dataset from a QuadPattern, given a graph pattern and an RDF Dataset.

Let P be a Graph Pattern and DS={DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} be an RDF Dataset and GS be the current state of the Graph Store. Then

Dataset ( QuadPattern, P, DS, GS ) = Dataset-UNION ( { Dataset ( QuadPattern, μ, DS, GS ) | μ in eval'( DS ( DG ), P ) } )

i.e., the union over all μ such that μ is in the solutions of P over dataset DS.

Here, eval'() is defined exactly like the evaluation function eval() in the SPARQL 1.2 Query Language, with the only exception, that here — as opposed to the treatment of blank nodes in BGP matching for SPARQL 1.2 Query — the scoping graph SG used for BGP matching is equal to the active graph, i.e., blank nodes from the active graph are preserved in solutions.

The definition of eval'() guarantees that co-referent blank nodes in DS are not "lost" during pattern evaluation, cf. Treatment of Blank Nodes in SPARQL 1.2 Query Language. The latter is necessary to ensure that blank nodes in DS can be matched against existing blank nodes in GS to remove/add triples. In order to illustrate matching against existing blank nodes in the Graph Store, the following update request removes all triples with blank node as subject.

DELETE { ?S ?P ?O . } WHERE { ?S ?P ?O . FILTER ( isBlank ( ?S ) ) }

Data before:

# Default graph
PREFIX :      <http://example.com/>
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

_:b a foaf:Person .
:s  a foaf:Person .

Data after:

# Default graph
PREFIX foaf:  <http://xmlns.com/foaf/0.1/>

:s  a foaf:Person .

Definition: Insert Data Operation

A Insert Data Operation is an Update Operation in which new triples, given as a (ground) QuadPattern, are added in the Graph Store GS, in the default slot or in named slots.

OpInsertData(GS, QuadPattern) = Dataset-UNION(GS, Dataset ( QuadPattern, {}, GS, GS ) )

where {} is the empty solution mapping.

Definition: Delete Data Operation

A Delete Data Operation OpDeleteData is an Update Operation in which triples, given as a (ground) QuadPattern, are removed from the Graph Store GS, from the default slot or from named slots.

OpDeleteData ( GS, QuadPattern) = Dataset-DIFF ( GS, Dataset ( QuadPattern, {}, GS, GS ) )

where {} is the empty solution mapping.

Definition: Delete Insert Operation

A Delete Insert Operation OpDeleteInsert is an Update Operation in which (1) triples are deleted from the Graph Store GS, either from the default slot or from named slot(s), and then (2) new triples are added in the Graph Store GS, either in the default slot or in named slot(s). Triples to be removed (and inserted, respectively) are identified by applying the pattern solutions for a Group Graph Pattern P against DS to the QuadPattern QuadPattern_DEL (and QuadPattern_INS, respectively).

OpDeleteInsert ( GS, DS, QuadPattern_DEL, QuadPattern_INS, P) = Dataset-UNION ( Dataset-DIFF ( GS, Dataset ( QuadPattern_DEL, P, DS, GS ) ), Dataset ( QuadPattern_INS, P, DS, GS )

Definition: Load Operation

A Load Operation OpLoad is an Update Operation in which new triples (from a remote graph) are added in the Graph Store, either in the default slot or in a named slot, if specified.

OpLoad ( GS, documentIRI) = Dataset-UNION ( GS, { graph ( documentIRI ) } )

OpLoad ( GS, documentIRI, iri ) = Dataset-UNION(GS, { {}, ( iri, graph ( documentIRI ) ) } )

where graph(documentIRI) is a function returning the RDF graph serialized by the RDF document retrieved from IRI documentIRI, where blank nodes present in the retrieved graph are supposed to be "standardized apart"; i.e., blank nodes from a loaded graph need to be disjoint with the blank nodes already present in the Graph Store GS.

Definition: Clear Operation

A Clear Operation OpClear is an Update Operation in which triples are deleted from the Graph Store, either from a named slot, the default slot, all named slots or all slots. There are different variants of the Clear Operation, OpClear for clearing a named graph, OpClear_def for clearing the default graph, OpClear_named for clearing all named graphs, and OpClear_all for clearing all graphs including the default graph.

Let GS = {DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} and graphNames(GS) = { iri_i | 1 ≤ i ≤ n}, then

OpClear(GS, iri) = GS if iri not in graphNames(GS); otherwise, OpClear(GS, iri_j) = ( GS minus {(iri_j, G_j)} ) union {(iri_j,{})}, where (iri_j, G_j) ∈ GS and iri = iri_j

OpClear_def(GS) = {{}} union {(iri_i, G_i) | 1 ≤ i ≤ n}

OpClear_named(GS) = {DG} union {(iri_i, {}) | 1 ≤ i ≤ n}

OpClear_all(GS) = {{}} union {(iri_i, {}) | 1 ≤ i ≤ n}

Note

Since Graph Stores may remove graphs that are left empty, for such Graph Stores any Clear Operation performed on a named graph may be viewed as immediately followed by a Drop Operation, see below.

Definition: Create Operation

A Create Operation OpCreate is an Update Operation in which (1) a new named slot and (2) a new graph G are created in the Graph Store. The new graph is held in the new slot, and is empty. Other slots and graphs are not affected.

Let GS = {DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} and graphNames(GS) = { iri_i | 1 ≤ i ≤ n}, then

OpCreate(GS, iri) = GS union {(iri, {})} if iri not in graphNames(GS); otherwise, OpCreate(GS, iri) = GS

Note

Since Graph Stores may remove graphs that are left empty, for such Graph Stores any Create Operation performed on an empty or non-existent graph may be viewed as implicitly immediately followed by a Drop Operation (see next subsection), or simply as an operation with no effect.

Definition: Drop Operation

A Drop Operation OpDrop is an Update Operation in which one or more slots (a named slot iri_i, the default slot, all named slots or all slots) and their corresponding graphs are removed from the Graph Store. There are different variants of the Drop Operation, OpDrop for dropping a named graph, OpDrop_def for dropping the default graph (which is equivalent to OpClear_def, since the default graph cannot be removed, but dropping it means only to clear it), OpDrop_named for dropping all named graphs, and OpDrop_all for dropping all graphs including the default graph.

Let GS = {DG} union {(iri_i, G_i) | 1 ≤ i ≤ n} and graphNames(GS) = { iri_i | 1 ≤ i ≤ n}, then

OpDrop(GS, iri) = GS if iri not in graphNames(GS); otherwise, OpDrop(GS, iri_j) = {DG} union {(iri_i, G_i ) | i ≠ j and 1 ≤ i ≤ n} where iri = iri_j

OpDrop_def(GS) = OpClear_def(GS)

OpDrop_named(GS) = {DG}

OpDrop_all(GS) = {{}}

In this section we show how to map Update Requests in the SPARQL 1.2. Update Language to Update Operations over the Graph Store as defined earlier in this section. This mapping assumes that in all Update requests, any PREFIXes have been expanded. Moreover, we assume that WITH clauses have been replaced by wrapping both the QuadPatterns in subsequent DELETE and INSERT clauses, and likewise — in the absence of USING and USING NAMED clauses — the GroupGraphPattern in the subsequent WHERE clause, into GRAPH patterns.

The mapping from requests to Update Operations is defined in terms of the recursive translation function Tr(GS,R) which takes the Graphstore GS — as before executing the request — and an update request R as input and exands it to an Update Operation call as shown in the following table. The COPY, MOVE, and ADD operations are not mentioned explicitly here, since they are understood as shortcuts.

Table 1: Mapping from Update Requests to Update Operations
Update request R	Tr(GS,R) =
R₁ ; R₂	Tr(Tr(GS, R₁), R₂)
`INSERT DATA` QuadData	OpInsertData(GS, QuadData)
`DELETE DATA` QuadData	OpDeleteData(GS, QuadData)
`DELETE` QuadPattern_DEL `INSERT` QuadPattern_INS UsingClause* `WHERE` GroupGraphPattern	OpDeleteInsert(GS, Tr_Dataset(GS,UsingClause), QuadPattern_DEL, QuadPattern_INS, GroupGraphPattern*)
`DELETE` QuadPattern_DEL UsingClause* `WHERE` GroupGraphPattern	OpDeleteInsert(GS, Tr_Dataset(GS,UsingClause), QuadPattern_DEL, {}, GroupGraphPattern*)
`INSERT` QuadPattern_INS UsingClause* `WHERE` GroupGraphPattern	OpDeleteInsert(GS, Tr_Dataset(GS,UsingClause), {}, QuadPattern_INS, GroupGraphPattern*)
`DELETE WHERE` QuadPattern	OpDeleteInsert(GS, GS, QuadPattern, {}, QuadPattern)
`LOAD (SILENT)?` IRIref	OpLoad(GS, IRIref)
`LOAD (SILENT)?` IRIref_from `INTO GRAPH` IRIref_to	OpLoad(GS, IRIref_from, IRIref_to)
`CLEAR (SILENT)? GRAPH` IRIref	OpClear(GS, IRIref)
`CLEAR (SILENT)? DEFAULT`	OpClear_def(GS)
`CLEAR (SILENT)? NAMED`	OpClear_named(GS)
`CLEAR (SILENT)? ALL`	OpClear_all(GS)
`CREATE (SILENT)? GRAPH` IRIref	OpCreate(GS, IRIref)
`DROP (SILENT)? GRAPH` IRIref	OpDrop(GS, IRIref)
`DROP (SILENT)? DEFAULT`	OpDrop_def(GS)
`DROP (SILENT)? NAMED`	OpDrop_named(GS)
`DROP (SILENT)? ALL`	OpDrop_all(GS)

This table uses one auxiliary translation function Tr_Dataset() which constructs a dataset from the optional set of USING and USING NAMED clauses and is defined as follows:

Table 2: Mapping *UsingClause*s to RDF Datasets
Translation Function	Definition
Tr_Dataset(GS,UsingClause*) =	the RDF Dataset DS described by the UsingClauses, if non-empty the RDF Dataset corresponding to the current state of GS, otherwise

Note

How exactly an RDF Dataset is obtained from the USING and USING NAMED clauses (e.g., by dereferencing graph name IRIs and trying to retrieve them, or by picking those graphs from the existing Graph Store) is implementation dependent. Particularly, this specification does not mandate any assumptions about blank node identity beyond the consideration for the analogous FROM and FROM NAMED clauses in Section Specifying RDF Datasets of the SPARQL 1.2 Query Language specification.

SPARQL 1.2 Update

Abstract

Status of This Document

1. Set of Documents

2. Introduction

2.1 Document Conventions

2.1.1 Language Form

2.1.2 Terminology

3. The Graph Store

3.1 Graph Store and SPARQL Query Services

3.2 SPARQL 1.2 Update Services

3.3 Entailment and Consistency

4. SPARQL 1.2 Update Language

4.1 Graph Update

4.1.1 INSERT DATA

4.1.2 DELETE DATA

4.1.3 DELETE/INSERT

4.1.3.1 DELETE (Informative)

4.1.3.2 INSERT (Informative)

4.1.3.3 DELETE WHERE

4.1.4 LOAD

4.1.5 CLEAR

4.2 Graph Management

4.2.1 CREATE

4.2.2 DROP

4.2.3 COPY

4.2.4 MOVE

4.2.5 ADD

5. SPARQL Update Formal Model

5.1 General Definitions

5.1.1 Graph Store

5.1.2 Abstract Update Operation

5.2 Auxiliary Definitions

5.2.1 Dataset-UNION

5.2.2 Dataset-DIFF

5.2.3 Dataset ( QuadPattern, μ, DS, GS )

5.2.4 Dataset ( QuadPattern, P, DS, GS )

5.3 Graph Update Operations

5.3.1 Insert Data Operation

5.3.2 Delete Data Operation

5.3.3 Delete Insert Operation

5.3.4 Load Operation

5.3.5 Clear Operation

5.4 Graph Management Operations

5.4.1 Create Operation

5.4.2 Drop Operation

5.5 Mapping Update Requests to the Formal Model

6. Conformance

6.1 Conformance

7. Security Considerations

8. Internet Media Type, File Extension and Macintosh File Type

9. SPARQL 1.2 Update Grammar

A. Changes between SPARQL 1.1 Update and SPARQL 1.2 Update

B. Privacy Considerations

C. Security Considerations

D. Internationalization Considerations

E. Index

E.1 Terms defined by this specification

E.2 Terms defined by reference

F. References

F.1 Normative references

5.2.3 Dataset ( `QuadPattern`, μ, DS, GS )

5.2.4 Dataset ( `QuadPattern`, P, DS, GS )