xml module build scripts

Where are the properties like public.pacakges and module.dependencies 
declared?

  <target name="jar-with-module-deps" if="module.dependencies">
      <property file="../spec-vers.properties"/>
      <jar jarfile="${netbeans.dest.dir}/${cluster.dir}/${module.jar}" 
compress="false" manifest="${manifest.mf}">
          <manifest>
              <attribute name="OpenIDE-Module-Specification-Version" 
value="${xml.core.spec.version}"/>
              <attribute name="OpenIDE-Module-Implementation-Version" 
value="${xml.common.impl.version}"/>
              <attribute name="OpenIDE-Module-Build-Version" 
value="${buildnumber}"/>
              <attribute name="OpenIDE-Module-Public-Packages" 
value="${public.packages}"/>
              <attribute name="OpenIDE-Module-IDE-Dependencies" 
value="${ide.dependencies}"/>
              <attribute name="OpenIDE-Module-Module-Dependencies" 
value="org.openide.io > 1.0,
  org.netbeans.api.xml/1 > ${xml.api.spec.version}"/>
          </manifest>
            <fileset dir="${build.classes.dir}"/>
        </jar>
    </target>


Also, what's the "scheme" for the specification versions.  It all looks 
quite arbitrary to me, and I'm having the darndest time building/running 
modules that depend on xml-core, xml-tools, etc.

Rich