Taglib-Block doesn't work? (Deprecated?)

[Stephan Coboos]

Hello,
I had tried to write my own taglib using the TagTransformer but it 
doesn't work. I can't find some informations about it, so I had copied 
the example and changed something but it doesn't work. I want to use a 
tag <hello/> to print out "HELLO WORLD". My changes in detail:

1.) I had written my own class HelloWorldTag:
package foo.bar.taglib;
import org.apache.cocoon.taglib.XMLProducerTagSupport;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;
public class HelloWorldTag extends XMLProducerTagSupport {
  public int doStartTag(String namespaceURI, String localName, String 
qName, Attributes atts)
      throws SAXException {
               String hello = "HELLO WORLD";
                this.xmlConsumer.characters(hello.toCharArray(), 0, 
hello.length());
            this.getLogger().error("T E X T = " + hello);
            return this.EVAL_BODY;
  }
}

2.) I had created a subproject tagtest containing a xml file tagtest.xml:
<?xml version="1.0" encoding="ISO-8859-1"?>
<root xmlns:test="urn:apache:taglib:hello">
<test:hello/>
</root>
3.) My sitemap looks as follow:
<?xml version="1.0" encoding="UTF-8"?>
<map:sitemap xmlns:map="http://apache.org/cocoon/sitemap/1.0";>
<map:components>
 <map:transformers default="tag">
    <map:transformer name="tag" 
src="org.apache.cocoon.transformation.TagTransformer" pool-max="64" 
pool-min="0" pool-grow="2" logger="sitemap.transformer.newtag">
      <transformer-hint>tag</transformer-hint>
    </map:transformer>
 </map:transformers>

</map:components>
<map:pipelines>
 <map:pipeline>
    <map:match pattern="">
       <map:generate type="file" src="tagtest.xml"/>
       <map:transform type="tag"/>
       <map:serialize type="xml"/>
    </map:match>
 </map:pipeline>
</map:pipelines>
</map:sitemap>
3.) In cocoon.xconf I had registered the tag :
  <taglib 
class="org.apache.cocoon.components.ExtendedComponentSelector" 
logger="sitemap.taglib.core" name="urn:apache:taglib:hello">
    <tag class="foo.bar.taglib.HelloWorldTag" 
logger="sitemap.taglib.core.source" name="hello"/>
  </taglib>

4.) After calling http://localhost:8080/cocoon/tagtest the tag <hello/> 
will not be replaces by "HELLO WORLD". I got the following output - 
nothing parsed:

<?xml version="1.0" encoding="ISO-8859-1" ?>
  <root xmlns:test="urn:apache:taglib:hello">
  <test:hello />
</root>
What is wrong here? Thank you for your help.
PS: I had tried the taglib block it seems it doesn't work, too! Whats 
about this block? Is it deprecated?

Regards
Stephan