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-<!--
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
--->
-<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>