Use Dictation in srgs xml

Hi. I am using GrammarRecognizer, to load an XML file containing the srgs grammar. To be able to get variable Input like e.g. Names, I want to use dictation. When using System.Speech.Recognition.SrgsGrammar to create the XML file, SrgsRuleRef.Dictation seems to do that, but the result is not working. My test file looks like this:

 <?xml version="1.0" encoding="utf-8"?>
 <grammar xml:lang="de-DE"
          root="root"
          tag-format="properties-ms/1.0"
          version="1.0"
          xmlns="http://www.w3.org/2001/06/grammar">
   <rule id="dictationtest"
         scope="public">
     <item>hello, my name is</item>
     <item repeat="0-3">
       <ruleref uri="grammar:dictation" />
       <tag>dictation="name"</tag>
     </item>
   </rule>
   <rule id="root">
     <one-of>
       <item>Hello</item>
       <item>
         <ruleref uri="#dictationtest" />
       </item>
     </one-of>
   </rule>
 </grammar>

It is working, when I use text like "Sam" instead of ">ruleref uri="grammar:dictation" type="application/srgs+xml"/<". I also read about variations of this tag like >ruleref uri="grammar:dictation" type="application/srgs+xml"/< or in a more general way >DICTATION PROPID="PID_FirstName"/< Note that I changed > and <, so that it won't be seen as HTML tags. Maybe you also know something else, I could use. Thanks for your help and advise.