0.8.1-rc1/metadata/src/test/resources/product-type-patterns.xml

<config>
    <!-- <element> MUST be defined before <product-type> so their patterns can be resolved -->
    <!-- name MUST be an element defined in elements.xml (also only upper and lower case alpha chars) -->
    <!-- regexp MUST be valid input to java.util.regex.Pattern.compile() -->
    <element name="ISBN" regexp="[0-9]{10}"/>
    <element name="Page" regexp="[0-9]*"/>

    <!-- name MUST be a ProductType name defined in product-types.xml -->
    <!-- metadata elements inside brackets MUST be mapped to the ProductType, as defined in product-type-element-map.xml -->
    <product-type name="Book" template="book-[ISBN].txt"/>
    <product-type name="BookPage" template="page-[ISBN]-[Page].txt"/>
</config>