grarchetype-common/src/test/archetypes/basic/META-INF/maven/archetype-metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
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  ~ or more contributor license agreements.  See the NOTICE file
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  ~ to you under the Apache License, Version 2.0 (the
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<archetype-descriptor name="basic" partial="false" >

  <requiredProperties>
    <requiredProperty key="propertyWithDefault">
      <defaultValue>default-value</defaultValue>
    </requiredProperty>
    <requiredProperty key="propertyWithoutDefault"/>
  </requiredProperties>

  <fileSets>
    <fileSet filtered="true" packaged="true" engine="groovy">
      <directory>src/main/java</directory>
      <includes>
        <include>**/*.java</include>
      </includes>
    </fileSet>
    <fileSet filtered="false" packaged="false">
      <directory>src/main/resources</directory>
      <includes>
        <include>**/*.png</include>
      </includes>
    </fileSet>
  </fileSets>

</archetype-descriptor>