[Required] false [Attribute Constraints] none [Type] NMTOKEN [Default Value] "none" platform-specific [Valid Values] "none", "null", "ecmascript", "xpath" or other platform-defined values. [Description] The datamodel that this document requires. "none" "null" denotes the Empty Null datamodel, "ecmascript" the ECMAScript datamodel, and "xpath" the XPath datamodel, as defined in D Data Models . [Name] 
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