Deconstruct values in Query Data Model
Example : Attributes
name : AttrNode -> Ref(QNameValue)
value : AttrNode -> Ref(ValueNode)
type : AttrNode -> Ref(ElemNode)
<xsd:attribue name=price
type=xsd:decimal/>
<part price=10.50/>
name(A1) = ref(qnameValue(null, price))
value(A1) = ref(decimalValue(10.50, Ref(Def_decimal)))
type(A1) =
<!-- data model representation of simple type decimal
-->
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