title: Ant exec task: How to break one long argument into multiple lines
body: <p>In my Ant skript, i'm executing a program, passing some arguments, of which one is a very long argument:</p>
  
  <pre><code>&lt;exec executable="${conf.GLASSFISH}/bin/asadmin" failonerror="true" vmlauncher="false"&gt;
    &lt;arg line="create-auth-realm" /&gt;
    &lt;arg line="--classname com.sun.enterprise.security.auth.realm.jdbc.JDBCRealm" /&gt;
    &lt;arg line="--property jaas-context=${conf.auth.jaas-context}:datasource-jndi=${conf.auth.datasource-jndi}:user-table=${conf.auth.usertable}:user-name-column=${conf.auth.usernamecolumn}:password-column=${conf.auth.passwordcolumn}:group-table=${conf.auth.grouptable}:group-name-column=${conf.auth.groupnamecolumn}:assign-groups=${conf.auth.assigngroups}:digest-algorithm=${conf.auth.digest}" /&gt;
    &lt;arg line="jdbcRealm" /&gt;
  &lt;/exec&gt;
  </code></pre>
  
  <p>How can i split the 3rd argument into multiple lines, so the ant-skript is more readable (lower line width)? Something like this (\ is just a placeholder to demonstrate what i need):</p>
  
  <pre><code>&lt;exec executable="command"&gt;
    &lt;arg line="--property PROP1:\\"/&gt;
    &lt;arg line="PROP2:\\"/&gt;
    &lt;arg line="PROP3\\"/&gt;
  &lt;/exec&gt;
  </code></pre>
  
  <p>So when Ant executes this it should result in the following command:</p>
  
  <pre><code>command --property PROP1:PROP2:PROP3
  </code></pre>
  
  <p>How can i realize that?</p>