Definition of the nature for a given signal, or variable, in terms of absolute or relative.
<xsd:simpleType name="ReferenceContext"> <xsd:union> <xsd:simpleType> <xsd:restriction base="xsd:string"> <xsd:enumeration value="relative"/> <xsd:enumeration value="absolute"/> </xsd:restriction> </xsd:simpleType> <xsd:simpleType> <xsd:restriction base="parameter"/> </xsd:simpleType> </xsd:union> </xsd:simpleType>
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