<!ENTITY % creation "
    created-by    CDATA #REQUIRED
    created-on    CDATA #REQUIRED
    ">
<!ENTITY % creationtime "
    created-on    CDATA #REQUIRED
    ">
<!ENTITY % modification "
    modified-by   CDATA #IMPLIED
    modified-on   CDATA #IMPLIED
    ">
<!ENTITY % modificationtime "
    modified-on   CDATA #IMPLIED
    ">
<!ELEMENT root ((node*|template?|editor?)*)>
<!ATTLIST root
    version       CDATA #REQUIRED
    %creation;
    %modification;
>
<!ELEMENT comment (#PCDATA)>
<!ATTLIST comment
    %creation;
    %modification;
>
<!ELEMENT editor (user*)>
<!ATTLIST editor
    %creationtime;
>
<!ELEMENT node (comment?, node*)>
<!ATTLIST node
    %creation;
    %modification;
    label         CDATA #REQUIRED
>
<!ELEMENT template (title*)>
<!ATTLIST template
    %creationtime;
    %modification;
>
<!ELEMENT title (#PCDATA)>
<!ATTLIST title
    %creationtime;
    %modificationtime;
    level         CDATA #REQUIRED
>
<!ELEMENT user (#PCDATA)>
<!ATTLIST user
    uid           CDATA #REQUIRED
    %creationtime;
>