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I use successfully next code:

     <property name="Version1" value="true"/>
     <property name="false" value="false"/>
<target ...>
<copy ...>
      <fileset dir="${dir}">
        <include name="**/*.xml" if="${Version1}"/>
        <include name="**/*.xsl" if="${Version1}"/>
      </fileset>
</copy>
but code like don`t work
<target ... if="${Version1}">
'if' in the target work only when I use if="constant".
This is design features or I do something wrong?

Ales