Platform for Internet Content Selection

Rating Services and Rating Systems

by David Singer (singer@almaden.ibm.com)

edited by Jim Miller (jmiller@w3.org) and Paul Resnick (presnick@research.att.com)

This document, which has been prepared for the technical subcommittee of PICS (Platform for Internet Content Selection), defines:

The meta-language used for the machine-readable description of a rating service.
The methods for locating the machine- and human-readable descriptions of rating services and systems.

Future documents will specify the syntax and semantics of content labels and protocol(s) for distributing labels.

In reading this document it is important to bear in mind that the goal of the PICS effort is to enable a marketplace in which many different products will be developed, tested, and compared. In particular, the following considerations have had significant impact on this document:

Some rating services may provide access to their ratings on-line, from a rating server, while others may either ship them in batches or transmit them on floppy disks or CD-ROMs.
Some rating systems may be used by more than one group. That is, a set of dimensions may be adequate for the purposes of a number of different organizations. These organizations will then use their own techniques and viewpoints to determine actual ratings. This motivates the distinction between a rating system and a rating service (see the glossary).
Some users of rating services may require more assurance of the validity of a rating than others. There is a trade-off between time, cost, and assurance; this must be left as a market differentiator.

What is a "rating service"?

A rating service is an individual, group, organization, or company that provides content labels for information on the Internet. The labels it provides are based on a rating system (see below). Each rating service must supply a machine-readable description of the its rating service, intended to simplify the job of specifying content selection criteria. This description uses a newly created MIME type, application/pics. User interface software that constructs filters based on PICS rating services can first load the machine-readable description of the service. This description allows the software to tailor its interface to reflect the details of particular rating service, rather than providing a "one design fits all rating services" interface.

A rating service is identified by a URL, included in the machine-readable description of the service, and used to mark the labels it produces. This URL identifies a human-readable description of the service. The human-readable description is not further specified in this document, but it is recommended that:

it be an HTML document organized for ease of use by novice computer users;
it should provide access to the human-readable description of the rating system used by the service;
it should be available in multiple languages (either through existing negotiation mechanism or through embedded pointers to alternate language versions).

This specification does not state how the machine-readable description of a rating service is initially located. For users of the World Wide Web, we expect that in the normal course of events there will be well-known sites that provide lists of rating services along with their human- and machine-readable descriptions.

What is a "rating system"?

A rating system specifies the dimensions used for labeling, the scale of allowable values on each dimension, and a description of the criteria used in assigning values. (A single rating system may be used by more than one rating service by arrangement between the owner of the system and the owners of the services.) A rating system is identified by a URL. This URL can be accessed to obtain a human-readable description of the rating system. The human-readable description is not further specified in this document, but it is recommended that:

it be an HTML document organized for ease of use by novice computer users;
it should be available in multiple languages (either through existing negotiation mechanism or through embedded pointers to alternate language versions).

What is a "content label"?

A content label (or rating) contains information about a document. The information can be supplied with the document or separately. A document may have many ratings, supplied by many different entities. The ratings may be carried in the document, in the HTTP header stream, via a separate on-line rating server, or on a portable medium (CD-ROM or floppy disk). Note specifically that there is no requirement that a rating be obtained via HTTP.

A content label (or rating) has three parts:

The URL of the rating service
A set of PICS-defined (and extensible) attribute-value pairs, which provide information about the rating such as the date that the rating was assigned or the entity doing the rating
A set of rating-system-defined attribute-value pairs, which actually rate the item along various dimensions (also called categories)

The detailed syntax of content labels and protocols for distributing them will appear in a future document.

The application/pics document type

A rating service is defined by a document of type application/pics. The detailed syntax and semantics are presented in the next two sections. Here is an example of such a document, intended only to illustrate the full set of features of a machine description:


((PICS-version 1.0)
 (rating-system "http://www.gcf.org/ratings")
 (rating-service "http://www.gcf.org/v1.0/")
 (icon "icons/gcf.gif")
 (name "The Good Clean Fun Rating System")
 (description "Everything you ever wanted to know about soap,
cleaners, and related products.  For demonstration purposes only.")

 (category  
  (transmit-as "suds")
  (name "Soapsuds Index")
  (min   0.0)
  (max   1.0))

 (category  
  (transmit-as "density")
  (name "suds density")
  (label (name "none") (value 0) (icon "icons/none.gif"))
  (label (name "lots") (value 1) (icon "icons/lots.gif")))

 (category  
  (transmit-as "subject")
  (name "document subject")
  (multivalue true)
  (label (name "soap") (value 0))
  (label (name "water") (value 1))
  (label (name "soapdish") (value 2))
  (label-only))

 (category  
  (transmit-as "color")
  (name "picture color")
  (integer)

  (category  
    (transmit-as "hue")
    (label (name "blue")  (value 0))
    (label (name "red")   (value 1))
    (label (name "green") (value 2)))

  (category  
   (transmit-as "intensity")
   (min 0)
   (max 255))))

Detailed syntax of application/pics

Notes:

Whitespace is ignored except in quoted strings.
The strings in transmit-as are case insensitive. All other strings are case sensitive.
This BNF grammar overly constrains the format. The optional attribute/value pairs in ratingservicedescription, categorylist and enum may occur in any order.
Additional attributes may be added over time. For experimental purposes, attributes with names beginning "x-" may be added at any time without prior arrangment. Extending the names that are formally part of this specification requires an additional consensus process before adoption.
This specification requires the use of UTF-7 encoding to allow for the inclusion of non-English description strings. Because internationalization is an area still under discussion in the standards community, this choice may well be subject to change in the near future. For those rating systems and services that use only the US-ASCII character set in their descriptive strings, UTF-7 allows direct encoding of the following (printable) characters: a-z, A-Z, 0-9, '(),-./:?!#$%&*;<=>@[]^_`{|} Notice that "+" is not included in this set, since it is used by the UTF-7 encoding system.
It is guaranteed that this and all future versions of the PICS machine-readable rating service description will begin with the version information, changing from 1.0 as specified here to other numbers as the specification is revised. Rating services are encouraged to place a version number in the rating-service URL, and to change to a new URL when an incompatible change must be made to their specification.

ratingservicedescription ::
  '(' version ratingsystem ratingservice
      [icondef] [name] [description]
      ['(' 'default' [min] [max] [multi] [integer] [labelled] ')']
      categorylist ')'
version :: '(' 'PICS-version' '1.0' ')'
ratingsystem :: '(' 'ratingsystem' quotedURL ')'
ratingservice :: '(' 'ratingservice' quotedURL ')'
quotedURL :: ' " ' URL ' " '
URL is as defined in RFC-1738 for URLs. In addition, PICS defines
   the following new form for referencing Internet Relay Chat (IRC)
   rooms:
   URL :: ... | 'irc://' host '/' alphanum 
       (where host is the usual Internet hostname)
icondef :: '(' 'icon' quotedURL ')'
name :: '(' 'name' quotedstring ')'
description :: '(' 'description' quotedstring ')'
quotedstring :: ' " ' UTF-7 ' " '
UTF-7 :: Characters encoded using UTF-7, with direct
   coding of US-ASCII set O except for the double-quote
   (decimal 34) which must be encoded to allow for its use as the
   string delimiter character.  See note above.
categorylist :: [1*n] 
  '(' 'category'
      '(' 'transmit-as' quotedshortname ')'
      [icondef] [name] [description] [min]
      [max] [multi] [integer] 
      [labelled] [enumlist] [categorylist]
  '}'
quotedshortname :: ' " ' [1*n]extendedalphanum ' " '
extendedalphanum :: 'A' | ... | 'Z' | 'a' | ... | 'z' | '+' | '-'
min :: '(' 'min' minnum ')'
max :: '(' 'max' maxnum ')'
minnum :: number | '-INF'
maxnum :: number | '+INF'
number :: [sign]unsignedint['.' [unsignedint]]
sign :: '+' | '-'
unsignedint :: [1*n][0-9]
multi :: '(' 'multivalue' [boolean] ')'
boolean :: 'true' | 'false'
integer :: '(' 'integer' [boolean] ')'
labelled :: '(' 'label-only' [boolean ] ')'
enumlist :: [1*n]enum 
enum ::
   '(' 'label' name [description]
       '(' 'value' number ')'
       [icondef]
   ')'

For reference, the following attributes are currently defined by the above BNF:

Within a rating service, there are the attributes category, default, description, icon, name and PICS.
Within a category, there are the attributes description, icon, integer, label, label-only, max, min, multivalue, name and transmit-as.
Within a named value, there are the attributes description, icon, name and value.

Semantics of the `application/pics` Description

Recall that the MIME type application/pics is intended to describe a particular rating service in sufficient detail to automatically generate a user interface for configuring a content selection filter using that rating service. The quotedURL in the ratingservice refers to the human-readable description of the rating service. This URL is included in all of the labels provided by the rating service. If the optional URL for an icon for the rating service is supplied, it is dereferenced relative to the rating service URL. The name of the rating system is intended to be short and human-readable, with the description being a longer description (suitable, perhaps, for a pop-up box). A complete human-readable description is available from the rating service's URL.

The quotedURL in the ratingsystem refers to the human-readable description of the rating system used by this rating service. All URLs in the description, except for the icon in the ratingservicedescription, are dereferenced relative to this URL. The rating service's icon is handled specially so that the service can maintain its own (possibly copyrighted) identity even if it chooses to share a rating system with other rating services.

The machine-readable description also describes the categories used in the rating system. There may be one or more categories for a given rating system. A single document may have a rating on any or all of these categories. Categories can be nested within one another.

A category has a "transmission name" which is used in the actual label for a document. Transmission names should be as short as reasonable. They must be unique within a given rating system (i.e. two categories in the same rating system must not have the same transmission name.) Unlike the name and description strings, transmission names are language-independent. That is, if a rating system is offered in several languages, the transmission names must be the same in all of them. Categories may be nested within one another (as in the case of color in the example rating system). In this case, the transmission name is created in the usual way by starting with the outermost category transmission name, adding a "/" and proceding inward in the nesting. Thus, the example rating system has three categories, and their transmission names are color, color/hue, and color/intensity. In addition to the transmission name, which is required, a category may optionally have an icon and a human-readable description.

Values in PICS labels may be integers or fractions with no greater range or precision than that provided by IEEE single-precision floating point numbers. The machine description for each category can specify restrictions on the range of permissible values for certain named attributes. Values may be restricted to have minimum (min attribute, defaults to -INF) or maximum (max attribute, defaults to +INF) values. Values can be restricted to integers by giving the attribute integer the value true (the default value is false if the attribute is omitted, but true if it is present with no value specified). Values may be given names by using the label attribute, and may be restricted to having only these named values by setting the attribute label-only to the value true (the default value is false if the attribute is omitted, but true if it is present with no value specified). When a value is given a name, it may optionally have attached an icon and a human-readable description. Finally, a given category may allow more than a single rating for a given document (consider the dimension "sizes available"); this is indicated by setting the attribute multivalue to true (default is false if the attribute is omitted, but true if it is present with no value specified).

For rating systems that contain large numbers of categories or deeply nested categories, it is convenient to allow for inheritance of some attribute values. In particular, the attributes of a category min, max, multivalue, integer, and label-only are inherited by a category from its parent. These attributes can be given default values for the entire rating service by using the default attributes. This corresponds to value inheritance in object-oriented systems or lexical scoping in programming languages.

Note: While it would be nice to restrict the numeric values of ratings to integers, the following examples motivate our decision to permit fractional values.

The MPAA rating system was changed to interpolate a new category (PG-13) between "PG" and "R". Had their system been encoded with a tightly packed integer scale it would have required rescinding many existing labels when the change occurred. With fractional numbers there is no need (in principle, at least) to renumber.
It may be desirable to include the cost of an item in a content label. This cost may not be an integral number of currency units (think, for example, of a micropayment system in which charges of small fractions of a cent are permitted).
Ratings may be generated by statistical means from the responses of many people. Such ratings could be rounded off to an integer before presentation, but this loses much important information.

Explanation of Sample Rating Service

Returning to the sample rating service, we see:

A full (human-readable) description of the rating system (i.e. the categories and scales) is available from http://www.gcf.org/ratings.
A full (human-readable) description of the rating service which provides the labels is available from http://www.gcf.org/. The labels themselves will have this URL in them to identify the service that created them.
There is an icon associated with the rating service, and it can be retrieved from "http://www.gcf.org/icons/gcf.gif" (formed by interpreting the icon attribute's value relative to the rating-service URL). The short description of the rating service is provided as the value of the description attribute of the rating system, "The Good Clean Fun Rating System."
There are four top-level categories in this rating system. The first has a transmission name of "suds" and is described as the "Soapsuds Index." The second has a transmision name of "density" and is described as "suds density," and so on.
The "Soapsuds Index" category is rated on a scale from 0.0 to 1.0, inclusive.
The "suds density" category can have ratings from -INF to +INF. But there are two values that have names and icons associated with them. The name "none" is the same as 0.0, and the name "lots" is the same as 1.0. These icons are found at http://www.gcf.org/ratings/icons/none.gif and http://www.gcf.org/ratings/icons/lots.gif (i.e. they are dereferenced relative to the rating-system URL).
The "document subject" category only allows the values 0.0, 1.0, and 2.0 to be used, but a single document can have any combination of these values. Each value has a name (0 is "soap," etc.). So one document might not have any rating on this category, while another is both a "soap" and a "soapdish."
The "picture color" category has two sub-categories. Values on the "picture color" dimension itself are restricted to integers, and will be transmitted as a category named "color." The first sub-category is transmitted as "color/hue" and the second as "color/intensity." Notice that color/hue can take on any integer value (because it inherits the integer attribute its parent, "color," category), but there are three values with names ("blue," "red," and "green."). The category color/intensity can take on any integer value between 0 and 255 (inclusive).

Glossary

application/pics: A new MIME data type, defined in this document.
BNF: Backus-Naur Form (or Backus Normal Form). A notation for describing a formal syntax, used extensively in describing programming languages and computer-readable data formats.
category: The part of a rating system which describes a particular criterion used for rating. For example, a rating system might have three categories named "sexual material," "violence," and "vocabulary." Also called a dimension.
content label: A data structure containing information about a given document's contents. Also called a rating or content rating. The content label may accompany the document it is about or be available separately.
content rating: See content label.
dimension: See category.
HTML: HyperText Markup Language. A means of representing hypertext documents. Based on SGML.
HTTP: HyperText Transfer Protocol. Used for retrieving document contents and/or descriptive header information.
hypertext: Text, graphics, and other media connected through links.
MIME: Multimedia Internet Message Extension. A technique for sending arbitrary data through electronic mail on the Internet.
PICS: Platform for Internet Content Selection, the name for both the suite of specification documents of which this is a part, and for the organization writing the documents. For more information, see http://www.w3.org/PICS
rating: See content label.
rating server: A computer system which supplies, via a computer network, ratings of documents. It may or may not provide the documents themselves.
rating service: An individual or organization that assigns labels according to some rating system, and then distributes them, perhaps via a rating server or via CD-ROM.
rating system: A method for rating information. A rating system consists of one or more categories.
scale: The range of permissible values for a category.
SGML: Standard Generalized Markup Language.
transmission name: (of a category) The short name intended for use over a network to refer to the category. This is distinct from the category name in as much as the transmission name must be language-independent, encoded in ASCII, and as short as reasonably possible. Within a single rating system the transmission names of all categories must be distinct.
URL: Uniform Resource Locator. Described in RFC-1738. A URL describes the location and means of retrieval for a single document. It consists of three components: the "scheme" (protocol used to retrieve a document, like "http" or "ftp"), a host name, and a hierarchical document name within that host. For example "http://www.w3.org/PICS" is the URL of the PICS home page. The scheme for retrieving it is "http," the host is "www.w3.org" and the name within that host is "PICS".
UTF-7: An encoding technique that can be used to transmit Unicode over 7-bit ASCII transport systems such as Internet electronic mail.

References

(To be completed, corrected, and formatted later)

Roy Fielding's RFC on relative URLs

IEEE Floating Point Format

RFC-1738 (URLs)

RFC-822

RFC-1642 (UTF-7 encoding)

ASCII

Appendix A: Good Clean Fun Rating Service

One of the simplest possible rating systems uses a single category, "Minimum recommended age." We present the machine description for a fictional service that uses this rating system.

((PICS-version 1.0)
 (rating-system "http://www.gcf.org/our-system/")
 (rating-service "http://www.gcf.org/our-service/v1.0/")
 (name "The Good Clean Fun Rating Service")
 (description "We estimate the maturity required to view materials on
the Internet.")
 (category (name "Minimum Age") (transmit-as "age") (integer true)))

Appendix B: RSAC Rating Service

As a specific example of a deployed rating service, encoded using the PICS machine-readable description format, we present the service supplied by the Recreational Software Advisory Council (RSAC). They use their own (copyrighted) rating system, which we include with their permission. The rating system contains three categories: Violence, Nudity/Sex, and Language. Each category is rated on a scale from 0 to 4, with a specific description for each value. Intermediate values are not permitted. The URLs presented here are fictitious, but represent reasonable choices should RSAC choose to deploy their system on-line.

((PICS-version 1.0)
 (rating-system "http://www.rsac.org/Ratings/Description/")
 (rating-service "http://www.rsac.org/v1.0")
 (icon "icons/rsac.gif")
 (name "The RSAC Ratings Service")
 (description "The Recreational Software Advisory Council rating
service.  Based on the work of Dr. Donald F. Roberts of Stanford
University, who has studied the effects of media on children for
nearly 20 years.")
 (default (label-only true))

 (category 
  (transmit-as "v")
  (name "Violence")
  (icon "icons/violence.gif")
  (label
   (name "Conflict")
   (description "Harmless conflict; some damage to objects")
   (value 0) (icon "icons/zero.gif"))
  (label
   (name "Fighting")
   (description "Creatures injured or killed; damage to objects; fighting")
   (value 1) (icon "icons/one.gif"))
  (label
   (name "Killing")
   (description "Humans injured or killed with small amount of blood")
   (value 2) (icon "icons/two.gif"))
  (label
   (name "Blood and Gore")
   (description "Humans injured or killed; blood and gore")
   (value 3) (icon "icons/three.gif"))
  (label
   (name "Wanton Violence")
   (description "Wanton and gratuitous violence; torture; rape")
   (value 4) (icon "icons/four.gif")))

 (category 
  (transmit-as "s")
  (name "Nudity/Sex")
  (icon "icons/sex.gif")
  (label
   (name "None")
   (description "No nudity or revealing attire / Romance; no sex")
   (value 0) (icon "icons/zero.gif"))
  (label
   (name "Revealing Attire")
   (description "Revealing attire / Passionate kissing")
   (value 1) (icon "icons/one.gif"))
  (label
   (name "Partial Nudity")
   (description "Partial nudity / Clothed sexual touching")
   (value 2) (icon "icons/two.gif"))
  (label
   (name "Frontal Nudity")
   (description "Non-sexual frontal nudity / Non-explicit sexual activity")
   (value 3) (icon "icons/three.gif"))
  (label
   (name "Explicit")
   (description
    "Provocative frontal nudity / Explicit sexual activity; sex crimes")
   (value 4) (icon "icons/four.gif")))

 (category 
  (transmit-as "l")
  (description "Language")
  (icon "icons/language.gif")
  (label (name "Slang")
         (description "Inoffensive slang; no profanity")
         (value 0) (icon "icons/zero.gif"))
  (label (name "Mild Expletives")
         (description "Mild expletives")
         (value 1) (icon "icons/one.gif"))
  (label (name "Expletives")
         (description "Expletives; non-sexual anatomical references")
         (value 2) (icon "icons/two.gif"))
  (label (name "Obscene Gestures")
         (description "Strong, vulgar language; obscene gestures")
         (value 3) (icon "icons/three.gif"))
  (label (name "Explicit")
         (description "Crude or explicit sexual references")
         (value 4) (icon "icons/four.gif"))))

Appendix C:

SafeSurf, a parents' organization, has established a rating system that is in use at a large and growing number of sites on the Internet. They have provided a machine-readable version of their system to PICS as a demonstration of a more complex rating system that includes sub-categories as well as a document classification system. The following specification includes a full description of the rating part of the SafeSurf system, with only a small stub to represent the classifications.

((PICS-version 1.0)
 (rating-system "http://www.safesurf.com/ratings/description/")
 (rating-service "http://www.safesurf.com/v1.0/")
 (icon "icons/ss~~.gif")
 (name "SafeSurf Parents' Organization")
 (description "The SafeSurf SS~~ Rating Standard.  Designed by and for
parents to empower each family to make informed decisions concerning
accessibility of online content. Copyright 1995.  All Rights Reserved.")

 (category 
  (transmit-as "Adult")
  (name "Adult Themes with Caution Levels") 
  (category (name "Age Range") (transmit-as "0")
    (label (value 1) (name "All Ages"))
    (label (value 2) (name "Older Children"))
    (label (value 3) (name "Teens"))
    (label (value 4) (name "Older Teens"))
    (label (value 5) (name "Adult Supervision Recommended"))
    (label (value 6) (name "Adults"))
    (label (value 7) (name "Limited to Adults"))
    (label (value 8) (name "Adults Only")) 
    (label (value 9) (name "Explicitly for Adults")))

  (category (name "Profanity") (transmit-as "1")
   (label (value 1) (name "Subtle Innuendo") 
    (description "Subtly Implied through the use of Slang"))
   (label (value 2) (name "Explicit Innuendo") 
    (description "Explicitly implied through the use of Slang"))
   (label (value 3) (name "Technical Reference") 
    (description
     "Dictionary, encyclopedic, news, technical references"))
   (label (value 4) (name "Non-Graphic-Artistic") 
    (description
     "Limited non-sexual expletives used in a artistic fashion"))
   (label (value 5) (name "Graphic-Artistic") 
    (description
     "Non-sexual expletives used in a artistic fashion"))
   (label (value 6) (name "Graphic") 
    (description "Limited use of expletives and obscene gestures"))
   (label (value 7) (name "Detailed Graphic") 
    (description "Casual use of expletives and obscene gestures"))
   (label (value 8) (name "Explicit Vulgarity") 
    (description
     "Heavy use of vulgar language and obscene gestures"))
   (label (value 9) (name "Explicit and Crude") 
    (description
     "Saturated with crude sexual references and gestures")))

  (category (name "Heterosexual Themes") (transmit-as "2")  
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8) (name "Explicit Vulgarity"))
    (label (value 9) (name "Explicit and Crude")))

  (category (name "Homosexual Themes") (transmit-as "3")
    (label (name "Subtle Innuendo") (value 1))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference")
      (description
       "Dictionary, encyclopedic, news, medical references"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8) (name "Inviting Adult Participation"))
    (label (value 9)
           (name "Explicitly Inviting Adult Participation")))

  (category (name "Nudity") (transmit-as "4")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2)   (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8) (name "Explicit Vulgarity"))
    (label (value 9) (name "Explicit and Crude")))

  (category (name "Violence") (transmit-as "5")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8)
       (name
        "Inviting Participation in Graphic Interactive Format"))
    (label (value 9)
      (name "Encouraging Personal Participation, Weapon Making")))

  (category (name "Sex Violence and Profanity")
            (transmit-as "6")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8) (name "Explicit Vulgarity"))
    (label (value 9) (name "Explicit and Crude")))

  (category (name "Bigotry") (transmit-as "7")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Literary"))
    (label (value 5) (name "Graphic-Literary"))
    (label (value 6) (name "Graphic Discussions"))
    (label (value 7) (name "Endorsing Hatred"))
    (label (value 8)
      (name "Endorsing Violent or Hateful Action"))
    (label (value 9)
      (name "Advocating Violent or Hateful Action")))

  (category (name "Glorifying Drug Use")
            (transmit-as "8")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8)
      (name "Simulated Interactive Participation"))
    (label (value 9)
      (name "Soliciting Personal Participation")))

  (category (name "Other Adult Themes") (transmit-as "9")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2)   (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Reference"))
    (label (value 4) (name "Non-Graphic-Artistic"))
    (label (value 5) (name "Graphic-Artistic"))
    (label (value 6) (name "Graphic"))
    (label (value 7) (name "Detailed Graphic"))
    (label (value 8) (name "Explicit Vulgarity"))
    (label (value 9) (name "Explicit and Crude")))

  (category (name "Gambling") (transmit-as "A")
    (label (value 1) (name "Subtle Innuendo"))
    (label (value 2) (name "Explicit Innuendo"))
    (label (value 3) (name "Technical Discussion"))
    (label (value 4) (name "Non-Graphic-Artistic, Advertising"))
    (label (value 5) (name "Graphic-Artistic, Advertising"))
    (label (value 6) (name "Simulated Gambling"))
    (label (value 7) (name "Real Life Gambling without Stakes"))
    (label (value 8)
      (name
       "Encouraging Interactive Real Life Participation with Stakes"))
    (label (value 9) (name "Providing Means with Stakes"))))
  
 (category (name "Classification with Percentage") (transmit-as "Class")
           (min 1) (max 100) (integer true) 
   (category (transmit-as "00") (name "General Information"))))