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+<!--
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+<html>
+
+<head>
+  <meta http-equiv="Content-Language" content="en-us"/>
+  <link rel="stylesheet" type="text/css" href="stylesheets/style.css"/>
+  <title>If and Unless on all tasks/nested elements</title>
+</head>
+
+<body>
+  <h1><a name="if_and_unless">If And Unless</a></h1>
+
+  <p>Since Ant 1.9.1 it is possible to add if and unless attributes on all tasks and nested elements using special namespaces.</p>
+
+  <p>In order to use this feature you need to add the following namespace declarations</p>
+  <blockquote><pre>
+    xmlns:if=&quot;ant:if&quot;
+    xmlns:unless=&quot;ant:unless&quot;
+    </pre>
+  </blockquote>
+
+  <p>The if and unless namespaces support the following 3 conditions :
+  <ul>
+    <li>true</li>true if the value of the attribute evaluates to true
+    <li>blank</li>true if the value of the attribute is null or empty
+    <li>set</li>true if the specified property is set
+  </ul></p>
+
+<blockquote>
+<pre>
+&lt;project name=&quot;tryit&quot;
+ xmlns:if=&quot;ant:if&quot;
+ xmlns:unless=&quot;ant:unless&quot;
+&gt;
+ &lt;exec executable=&quot;java&quot;&gt;
+   &lt;arg line=&quot;-X&quot; if:true=&quot;${showextendedparams}&quot;/&gt;
+   &lt;arg line=&quot;-version&quot; unless:true=&quot;${showextendedparams}&quot;/&gt;
+ &lt;/exec&gt;
+ &lt;condition property=&quot;onmac&quot;&gt;
+   &lt;os family=&quot;mac&quot;/&gt;
+ &lt;/condition&gt;
+ &lt;echo if:set=&quot;onmac&quot;&gt;running on MacOS&lt;/echo&gt;
+ &lt;echo unless:set=&quot;onmac&quot;&gt;not running on MacOS&lt;/echo&gt;
+&lt;/project&gt;
+</pre>
+</blockquote>
+
+</body>
+</html>