Have you tried this way - Got it from IBM Help.I have not tried it, but looks like, it should work. ( IBM ODM.8.0.1)
<target name="deployruleappwithxom">
<res-deploy hostname="${hostname}" portnumber="${portnumber}" webapp="${webapp}" userid="${userid}" password="${password}" file="my-ruleapp.jar">
<xompath rulesetpath="/MyRuleApp/MyRuleset">
<fileset dir="${lib}">
<include name="**/myxom.jar" />
</fileset>
</xompath>
<xompath rulesetpath="/AnotherRuleApp/AnotherRuleset">
<fileset dir="${otherlib}">
<include name="**/otherxom.jar" />
</fileset>
</xompath>
</res-deploy>
</target>
if you just looking for managing xomuri property, you can try this.
<target name="runloanvalidation">
<res-deploy-xom
hostname="localhost"
portnumber="9080"
webapp="res"
userid="resAdmin"
password="resAdmin"
jarMajorVersion="false"
libName="person"
outputRulesetProperty="ruleset.managedxom.uris">
<xompath>
<fileset dir="hello">
<include name="*.jar"/>
</fileset>
</xompath>
</res-deploy-xom>
<echo message="Resulting property: ${ruleset.managedxom.uris}"/>
</target>
And for more information, you can visit this.
http://www-01.ibm.com/support/knowledgecenter/#!/SSQP76_8.6.0/com.ibm.odm.dserver.rules.ref.res/ant_tasks/con_ant_res_deploy_xom.html