2.2.11 [XML] Section 3.3.1, Attribute Types

C0013:

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.

MSXML3 and MSXML6

Character references are not allowed in ENTITY names.

C0014:

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.

MSXML3 and MSXML6

Duplicate Nmtoken tokens can occur in the enumerated attribute types of a single element type.