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2.1.1 Static Content Definition: Substitution groups are defined in [XML Schema 1.0] and [XML Schema 1.1] Part 1. A partial pointer that includes a part designation. XML Schema 1.0 - http://www.w3.org/TR/xmlschema-1/#Element_Equivalence_Class 2.2.2.2 Element Substitution Group XML Schema 1.1 - http://www.w3.org/TR/xmlschema11-1/#Element_Equivalence_Class 2.2.2.2 Element Substitution Group