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Overwriting ant property from custom ant task
<property file="prop1"/>
<property file="prop2"/>

mg.prop = ${mg2.prop}

mg2.prop = Hello

String resolved = resolveProperty(propertyName);
getProject().setProperty(propertyName, resolved);

log("Resolved property value = " + getProject().getProperty(propertyName));

<echo message="${mg.prop}"/>

<concat destfile="resolved.properties">
    <fileset file="1.properties" />
    <fileset file="2.properties" />
    <fileset file="3.properties" />
</concat>

<property file="resolved.properties"/>

<property name="x" value="6"/>
<echo>${x}</echo>   <!-- will print 6 -->
<var name="x" unset="true"/>
<property name="x" value="12"/>
<echo>${x}</echo>   <!-- will print 12 -->