2.2.8 [XML] Section 3.2, Element Type Declarations

C0009:

The specification states:

 The element structure of an XML document may, for validation purposes, be 
 constrained using element type and attribute-list declarations. An element type 
 declaration constrains the element's content. Element type declarations often 
 constrain which element types can appear as children of the element. At user 
 option, an XML processor MAY issue a warning when a declaration mentions an element 
 type for which no declaration is provided, but this is not an error.

MSXML3 and MSXML6

The following clarifications apply:

  • The element structure is constrained when defined in the DTD or when the validateOnParse property is set to true; otherwise, validation does not occur. 

  • An error is raised when an element type is used in the XML document but not defined. No error is raised if the element type is not used.

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