grarchetype-plugin/src/test/archetypes/nested-properties-main/META-INF/maven/archetype-metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
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<archetype-descriptor name="nested-properties-main" partial="false" >

    <requiredProperties>
        <requiredProperty key="mainDefault">
            <defaultValue>1</defaultValue>
            <description>1</description>
        </requiredProperty>
        <requiredProperty key="aPropertyWithInner">
            <defaultValue>${mainNoDefault}</defaultValue>
            <description>1</description>
        </requiredProperty>
        <requiredProperty key="mainNoDefault">
            <description>1</description>
        </requiredProperty>
        <requiredProperty key="mainNoNothing"/>
    </requiredProperties>

    <fileSets/>

    <modules>
        <module artifactId="${rootArtifactId}-inner" nested="true" archetypeGroupId="archetypes" archetypeArtifactId="nested-properties-inner" archetypeVersion="1.0" />
    </modules>

</archetype-descriptor>