Description of problem:

If you give a <task> tag an id attribute, no HTML anchor is set. This means that <xref> tags that reference it point nowhere in particular.

Version-Release number of selected component (if applicable):


How reproducible:
Every time

Steps to Reproduce:
1. Create a <task id="foo">
2. create an <xref linkend="foo" />
3. Build your book
4. Click the link created by the <xref>. Notice that it goes nowhere.
  
Actual results:


Expected results:


Additional info:

According to jfearn this has to do with overriding of anchor-generation by Publican, to ensure valid HTML. It is related to a similar problem with <formalpara>.