The global BooleanExpression element is the head of a substitution group. Any element that is a member of the group may be substituted for the BooleanExpression element anywhere the BooleanExpression element may be used in an instance file.
<xs:element name="BooleanExpression" type="BooleanExpressionBaseType" abstract="true"><xs:annotation><xs:documentation>The global BooleanExpression element is the head of a substitution group. Any element that is a member of the group may be substituted for the BooleanExpression element anywhere the BooleanExpression element may be used in an instance file.</xs:documentation></xs:annotation></xs:element>