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  this work for additional information regarding copyright ownership.
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<!-- The DOCTYPE should be as follows for jdoquery documents.
<!DOCTYPE jdoquery
    PUBLIC "-//The Apache Software Foundation//DTD Java Data Objects Query Metadata 3.2//EN"
    "https://db.apache.org/jdo/xmlns/jdoquery_3_2.dtd">
-->
<!ELEMENT jdoquery (extension*, (package|query)+, (extension)*)>

<!ELEMENT package (extension*, (interface|class)+, (extension)*)>
<!ATTLIST package name CDATA ''>

<!ELEMENT interface (extension*, query+, extension*)>
<!ATTLIST interface name CDATA #REQUIRED>

<!ELEMENT class (extension*, query+, extension*)>
<!ATTLIST class name CDATA #REQUIRED>

<!ELEMENT query (#PCDATA|extension)*>
<!ATTLIST query name CDATA #REQUIRED>
<!ATTLIST query language CDATA #IMPLIED>
<!ATTLIST query unmodifiable (true|false) 'false'>
<!ATTLIST query unique (true|false) #IMPLIED>
<!ATTLIST query result-class CDATA #IMPLIED>
<!ATTLIST query datastore-read-timeout-millis CDATA #IMPLIED>
<!ATTLIST query datastore-write-timeout-millis CDATA #IMPLIED>

<!ELEMENT extension ANY>
<!ATTLIST extension vendor-name CDATA #REQUIRED>
<!ATTLIST extension key CDATA #IMPLIED>
<!ATTLIST extension value CDATA #IMPLIED>