2.1.10 [XML] Section 3.3.1, Attribute Types

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V0011:

The specification states:

 Validity constraint: ID
  
 Values of type ID MUST match the Name production. A name MUST NOT appear more 
 than once in an XML document as a value of this type; i.e., ID values MUST 
 uniquely identify the elements which bear them.

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An ID value is not required to uniquely identify the element that is associated with it

V0012:

The specification states:

 Validity constraint: One ID per Element Type
  
 An element type MUST NOT have more than one ID attribute specified.

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An element type may have more than one ID attribute specified.

V0013:

The specification states:

 Validity constraint: ID Attribute Default
  
 An ID attribute MUST have a declared default of #IMPLIED or #REQUIRED.

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An ID attribute is not required to have a declared default of #IMPLIED or #REQUIRED.

V0014:

The specification states:

 Validity constraint: IDREF
  
 Values of type IDREF MUST match the Name production, and values of type IDREFS 
 MUST match Names; each Name MUST match the value of an ID attribute on some 
 element in the XML document; i.e. IDREF values MUST match the value of some 
 ID attribute.

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An IDREF entity attribute is not required to match the value of an ID attribute on an element in the XML document.

V0015:

The specification states:

 Validity constraint: Entity Name
  
 Values of type ENTITY MUST match the Name production, values of type ENTITIES 
 MUST match Names; each Name MUST match the name of an unparsed entity declared 
 in the DTD.

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Entity attribute types and the ENTITIES set of entities are not checked for validity. Entity attribute types are not required to match the name of an unparsed entity that is declared in the DTD.

V0016:

The specification states:

 Validity constraint: Name Token
  
 Values of type NMTOKEN MUST match the Nmtoken production; values of type NMTOKENS 
 MUST match Nmtokens.

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Name token attribute types and the NMTOKENS set of name tokens are not checked for validity.

V0017:

The specification states:

 Validity constraint: Notation Attributes
  
 Values of this type MUST match one of the notation names included in the 
 declaration; all notation names in the declaration MUST be declared.

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A notation attribute is not required to match a notation that is specified in the notation declarations, and all of the notations that are declared in the notation declarations are not required to be declared.

V0018:

The specification states:

 Validity constraint: No Notation on Empty Element
  
 For compatibility, an attribute of type NOTATION MUST NOT be declared on an 
 element declared EMPTY.

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A NOTATION attribute may be declared on an element that is declared by using the EMPTY keyword.

V0019:

The specification states:

 Validity constraint: No Duplicate Tokens
  
 The notation names in a single NotationType attribute declaration, as well as 
 the NmTokens in a single Enumeration attribute declaration, MUST all be distinct.

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Both NotationalType attribute types and Enumeration attribute types may contain identical elements.

V0020:

The specification states:

 Validity constraint: Enumeration
  
 Values of this type MUST match one of the Nmtoken tokens in the declaration.
 For interoperability, the same Nmtoken SHOULD NOT occur more than once in the 
 enumerated attribute types of a single element type.

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Enumeration values are not required to be declared. The same token may occur more than once in an enumerated attribute type.