<xs:element name="identifier" type="CompoundResourceIdentifierType">
<xs:annotation>
<xs:appinfo xml:lang="en">An unambiguous reference to a resource within a given context. {An attribute stores the source of the tag's value} {sources: DCMI: identifier, v. 004; IC MSP v. 1.0a: IdentifierList} An identifier may be an internal, external, and/or universal identification label for representing a resource by means of a string or number conforming to a formal identification system. An example of an identifier would be an International Standard Serial Number (ISSN), or a Uniform Resource Locator (URL). Any type of identifier can be accommodated, so long as the identifier qualifier is specified with the identifier value. See also, DDMS Spec Category: Identifier.</xs:appinfo>
</xs:annotation>
</xs:element>
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