title: Use parameter/marker in a xslt query in typoscript
body: <p>to start with, i never had to do anything with Typo3. So typoscript was a <strong>real</strong> surprise for me.</p>
  
  <p>I have this Script done, all i have to do is to make it a little more variable, so the <strong>@id=</strong> part should be filled with an parameter from the URL.</p>
  
  <pre><code>plugin.xml_xpath_detail &lt; plugin.xml_xpath
  plugin.xml_xpath_detail.conf.renderObj &gt; 
  
  plugin.xml_xpath_detail.conf {
    xpath.path   = /interface/items/item[@id=123456]
    xpath.limit  = 1
  
    renderObj &gt;
    renderObj = COA
    renderObj.wrap = &lt;div style="padding:20px"&gt;|&lt;/div&gt;
    renderObj {
  
       20 = TEXT
       20.data = ###COMP_ID###
       20.wrap = &lt;p style="padding:10px; background-color:lime;"&gt;|&lt;/p&gt;
       20.required = 1
       20.stripHtml = 0
    }
  }
  </code></pre>
  
  <p>I know how to get the Parameter, and so i also have the id in an marker if i need it this way</p>
  
  <pre><code>COMP_ID.cObject = TEXT
  COMP_ID.cObject.value = GP:job
  </code></pre>
  
  <p>I can output the Parameter any time, as same as the Marker. But i have no idea how to modify the xpath.path to identify the Marker/Parameter.
  I tried all i could think of</p>
  
  <pre><code>  xpath.path   = /interface/items/item[@id=GP:job]
    xpath.path   = /interface/items/item[@id={GP:job}]
    xpath.path   = /interface/items/item[@id={GP::job}]
    xpath.path   = /interface/items/item[@id=###COMP_ID###]
    xpath.path   = /interface/items/item[@id='###COMP_ID###']
    xpath.path   = /interface/items/item[@id={###COMP_ID###}]
    ...
  </code></pre>
  
  <p>And all i get is an view with the defined placeholders, unreplaced.</p>
  
  <p>Maybe anyone here can point me into the right direction?</p>