outputFileNameMapping in dependencySet uses pom's artifactid

The descriptor below incorrectly produces a single output file in server/default/lib

<assembly xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/assembly-1.1.0-SNAPSHOT.xsd">

<id>deploy-structure-jboss422</id>
<formats>
<format>dir</format>
</formats>
<includeBaseDirectory>false</includeBaseDirectory>

<dependencySets>

<!-- bin -->
<dependencySet>
<outputDirectory>bin</outputDirectory>
<useStrictFiltering>true</useStrictFiltering>
<unpack>true</unpack>
<includes>
<include>*:jbossws-framework:zip:scripts</include>
</includes>
</dependencySet>

<!-- server/default/lib -->
<dependencySet>
<outputDirectory>server/default/lib</outputDirectory>
<outputFileNameMapping>$

{artifactId}

.$

{extension}</outputFileNameMapping>
<useStrictFiltering>true</useStrictFiltering>
<unpack>false</unpack>
<includes>
<include>*:jaxws-api:jar</include>
<include>*:jbossws-common:jar</include>
<include>*:jbossws-framework:jar</include>
<include>*:jbossws-spi:jar</include>
<include>*:saaj-api:jar</include>
</includes>
</dependencySet>
</dependencySets>

<moduleSets>
<!-- client -->
<moduleSet>
<includes>
<include>org.jboss.ws:jbossws-cxf-client</include>
</includes>
<binaries>
<outputDirectory>client</outputDirectory>
<outputFileNameMapping>${module.artifactId}.${module.extension}</outputFileNameMapping>
<unpack>false</unpack>
<dependencySets>
<dependencySet>
<outputFileNameMapping>${module.artifactId}.${module.extension}</outputFileNameMapping>
<useStrictFiltering>true</useStrictFiltering>
<includes>
<include>:cxf-</include>
<include>:geronimo-javamail</include>
<include>:geronimo-ws-metadata</include>
<include>*:jaxb-api:jar</include>
<include>*:jaxb-impl:jar</include>
<include>*:jaxb-xjc:jar</include>
<include>*:jaxws-api:jar</include>
<include>*:jbossws-common:jar</include>
<include>*:jbossws-framework:jar</include>
<include>*:jbossws-spi:jar</include>
<include>*:neethi:jar</include>
<include>*:saaj-api:jar</include>
<include>*:saaj-impl:jar</include>
<include>*:spring-beans:jar</include>
<include>*:spring-context:jar</include>
<include>*:spring-core:jar</include>
<include>*:stax-api:jar</include>
<include>*:wsdl4j:jar</include>
<include>*:xml-resolver:jar</include>
<include>*:XmlSchema:jar</include>
</includes>
</dependencySet>
<dependencySet>
<outputFileNameMapping>wstx.jar</outputFileNameMapping>
<useStrictFiltering>true</useStrictFiltering>
<includes>
<include>*:wstx-asl:jar</include>
</includes>
</dependencySet>
</dependencySets>
</binaries>
</moduleSet>
</moduleSets>

</assembly>

[tdiesler@tddell trunk]$ ls target/deploy-structure-jboss422/server/default/lib/
jbossws-cxf.${extension}