<!-- 

PICA XML 1.1 Document Type Definition.

This DTD defines a superset of PICA XML without restriction on attribute values
and without namespace requirement. Please use the PICA XML Schema for extended
validation.

Usage example:

    <?xml version="1.0" standalone="no"?>
    <!DOCTYPE collection SYSTEM "http://format.gbv.de/pica/xml/pica.dtd">
    <collection>
      ...
    </collection>

-->
<!ELEMENT collection (record+)>

<!ELEMENT record (datafield+)>
<!ATTLIST record 
    schema     CDATA #IMPLIED
>

<!ELEMENT datafield (subfield+)>
<!ATTLIST datafield 
    tag        CDATA #REQUIRED
    occurrence CDATA #IMPLIED
    label      CDATA #IMPLIED
    url        CDATA #IMPLIED
    pica3      CDATA #IMPLIED
>

<!ELEMENT subfield (#PCDATA)*>
<!ATTLIST subfield 
    code       CDATA #REQUIRED
    label      CDATA #IMPLIED
    url        CDATA #IMPLIED
    pica3      CDATA #IMPLIED
>
