<xs:element name="source" type="CompoundSourceIdentifierType">
<xs:annotation>
<xs:appinfo xml:lang="en">References to assets or resources from which the tagged data asset is derived. {Source: DCMI: type, v. 004} Sources may be derived partially or wholly, and it is recommended that an identifier (such as a string or number from a formal identification system) be used as a reference. See also, DDMS Spec Category: Source.</xs:appinfo>
</xs:annotation>
</xs:element>
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