<xsd:element name="var_ref" type="ind-def:EntityObjectVariableRefType" minOccurs="1" maxOccurs="1">
<xsd:annotation>
<xsd:documentation>The id of the variable you want.</xsd:documentation>
<xsd:appinfo>
<sch:pattern id="varobjvar_ref" xmlns:sch="http://purl.oclc.org/dsdl/schematron">
<sch:rule context="ind-def:variable_object/ind-def:var_ref">
<sch:assert test="not(@datatype) or @datatype='string'">
<sch:value-of select="../@id" /> - datatype attribute for the var_ref entity of a variable_object should be 'string'</sch:assert>
</sch:rule>
</sch:pattern>
</xsd:appinfo>
</xsd:annotation>
</xsd:element>
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