src/java/org/apache/ivy/plugins/resolver/packager/build.xml

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<project name="packager" default="build">

    <!-- Validate packager.xml -->
    <target name="validate" if="ivy.packager.validate">
        <xmlvalidate failonerror="true" warn="yes" lenient="no">
            <attribute name="http://xml.org/sax/features/namespaces" value="true"/>
            <attribute name="http://apache.org/xml/features/validation/schema" value="true"/>
            <attribute name="http://apache.org/xml/features/validation/schema-full-checking" value="true"/>
            <property name="http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation" value="packager-1.0.xsd"/>
            <fileset dir=".">
                <include name="packager.xml"/>
            </fileset>
        </xmlvalidate>
    </target>

    <!-- Set ${resourceURL} (case 1) -->
    <target name="setResourceURL1" if="ivy.packager.resourceURL">
        <property name="resourceURL" value="${ivy.packager.resourceURL}"/>
    </target>

    <!-- Set ${resourceURL} (case 2) -->
    <target name="setResourceURL2" unless="ivy.packager.resourceURL">
        <property name="resourceURL" value=""/>
    </target>

    <!-- Apply XSLT to generate ant build file -->
    <target name="style">
        <xslt style="packager.xsl" in="packager.xml" out="packager-output.xml">
            <param name="resourceURL" expression="${resourceURL}"/>
            <param name="restricted" expression="${ivy.packager.restricted}"/>
            <param name="quiet" expression="${ivy.packager.quiet}"/>
        </xslt>
    </target>

    <!-- Main build target: invoke generated build file -->
    <target name="build" depends="validate, setResourceURL1, setResourceURL2, style">
        <ant antfile="packager-output.xml"/>
    </target>

</project>