title: EL expression in custom tag parameter name
body: <p>I created custom tag for encoding and rewriting URLs with dynamic parameters. For ex.:</p>
  
  <pre><code>&lt;mytags:outUrl url="${value1}" id="${value2}" /&gt;
  </code></pre>
  
  <p>works as expected (<code>url</code> is standard parameter and <code>id</code> is first dynamic parameter).</p>
  
  <p>Is it possible to also have dynamic parameter names like this directly?</p>
  
  <pre><code>&lt;mytags:outUrl url="${var1}" ${name1}="${var2}" /&gt;
  </code></pre>
  
  <p>I know it is possible to use <code>&lt;jsp:attribute&gt;</code> but it is too much code:</p>
  
  <pre><code>&lt;mytags:outUrl url="${var1}"&gt;&lt;jsp:attribute name="${name1}"&gt;${var2}&lt;/jsp:attribute&gt;&lt;/mytags:outUrl&gt;
  </code></pre>