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          id CDATA #IMPLIED
          code CDATA #REQUIRED
          type CDATA #IMPLIED>
<!ELEMENT datafield (subfield+)>
<!ATTLIST datafield
          id CDATA #IMPLIED
          tag CDATA #REQUIRED
          ind1 CDATA #REQUIRED
          ind2 CDATA #REQUIRED>
<!ELEMENT controlfield (#PCDATA) >
<!ATTLIST controlfield
          id CDATA #IMPLIED
          tag CDATA #REQUIRED>
<!ELEMENT leader (#PCDATA) >
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<!ELEMENT record (leader, controlfield*, datafield*)>
<!ATTLIST record
          type (Bibliographic | Authority | Holdings | Classification | Community) "Bibliographic"
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<!ELEMENT collection (record+)>
<!ATTLIST collection
          id CDATA #IMPLIED>
