I read doc page on http://ant.apache.org/manual/Tasks/macrodef.html, but I can understand. There are no examples. How to use attribute URI in ANT MacroDef task?
I found solution here: http://mail-archives.apache.org/mod_mbox/ant-user/200606.mbox/%3C4489507F.5050503@mindspring.com%3E
<project name="test" xmlns:me="x.y.z">
<macrodef name="sample" uri="x.y.z">
<sequential>
<echo>Hello world</echo>
</sequential>
</macrodef>
<me:sample/>
</project>