netbeans.apache.org/src/content/dtds/helpcontext-1_0.dtd

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<!--
-//NetBeans//DTD Help Context 1.0//EN
https://netbeans.org/dtds/helpcontext-1_0.dtd
A JavaHelp help ID which could be used in a menu, etc.
May optionally display whole master help set, otherwise
just shows the help set in which the ID is defined.
Example usage:
<helpctx id="org.netbeans.modules.foo.some-topic"/>
-->
<!ELEMENT helpctx EMPTY>
<!ATTLIST helpctx
    id CDATA #REQUIRED
    showmaster (true | false) "false"
>