<!ELEMENT packages ( pkgmetadata* )>

<!-- Metadata for a category -->
<!ELEMENT catmetadata ( (longdescription)* )>
<!ATTLIST catmetadata pkgname CDATA "">

<!-- Metadata for a package -->
<!ELEMENT pkgmetadata ( (herd|maintainer|longdescription|use)* )>
<!ATTLIST pkgmetadata pkgname CDATA "">

  <!-- One tag for each herd this package is assigned to. -->
  <!ELEMENT herd (#PCDATA)>

  <!-- One tag for each maintainer of a package, multiple allowed-->
  <!ELEMENT maintainer ( email, (description| name)* )>

  <!-- A long description of the package in freetext-->
  <!ELEMENT longdescription (#PCDATA|pkg)* >

  <!-- The changelog of the package-->
  <!ELEMENT changelog (change)* >
    <!-- The changelog contains various "changes"-->
    <!ELEMENT change (date,(developer|version|description|file|contributor|bug)*) >
      <!ELEMENT date (#PCDATA) >
        <!-- The date of the change, in "YYYY-MM-DD" format -->
      <!ELEMENT developer (name?,email) >
        <!-- The developer that made the change. The email is required, name
	   is optional-->
      <!ELEMENT version (#PCDATA) >
        <!--version of the packages involved (one tag per version)-->
      <!ELEMENT file (#PCDATA) ><!-- one tag per file touched -->
      <!ELEMENT contributor (name?,email?) >
        <!-- A reference to a user that helped in causing this change. 
          There should at least be a name or email address included. 
          Email is preferred -->
      <!ELEMENT bug (#PCDATA) >
        <!-- bug-id of a bug fixed by this change, multiple allowed. The 
          format of this is a number or alias for a bug. NOT including a 
          # character -->

  <!-- description of what this USE flag does for this package -->
  <!ELEMENT use (flag)* >
    <!ELEMENT flag (#PCDATA|pkg)* >
      <!-- name attribute holds the name of the USE flag -->
      <!ATTLIST flag name CDATA #REQUIRED >

  <!-- category/package information for cross-linking in descriptions
    and useflag descriptions -->
  <!ELEMENT pkg (#PCDATA) >
          
<!-- Common attributes -->

<!-- the lang attribute, specifies the language of this tag. This is 
  only useful for descriptions of various kinds. If a tag with this 
  attribute is included there must be a description in the default 
  language "C" or "en", which is equivalent -->
  <!ATTLIST description lang CDATA "C" >
  <!ATTLIST longdescription lang CDATA "C" >
  <!ATTLIST use lang CDATA "C" >

<!-- The restrict attribute, this attribute specifies restrictions on 
  the applicability of tags on versions. The format of this attribute is 
  equal to the format of DEPEND lines in ebuilds. There is one special 
  value though: restrict="*". A tag that specifies this only applies if 
  there are no other tags that apply.
  
  For required tags, there must be either an unrestricted version, or a 
  version that is default restricted. -->
  <!ATTLIST herd restrict CDATA #IMPLIED >
  <!ATTLIST maintainer restrict CDATA #IMPLIED >
  <!ATTLIST longdescription restrict CDATA #IMPLIED >
  <!ATTLIST flag restrict CDATA #IMPLIED >


<!-- standard parts -->
<!ELEMENT email (#PCDATA) ><!-- an email address -->
<!ELEMENT name (#PCDATA) ><!-- the name of a person (maintainer, contributor)-->
<!ELEMENT description (#PCDATA) ><!-- A description of a maintainer or change-->