XLink & XPointer in real world app

1. Do you know some real examples of implementation and real use of extended XLink and XPointer?
2. Does extended XLink or XPointer have some data model - can it be somehow a part of the DOM?
3. Are there some standard approaches (libraries) how to process extended XLink on .NET (Visual Basic)?
4. I'm interested in XBRL whose concept partly stands on the use of extended XLink (linkbases), but I have a doubts whether the XBRL could be succesfull in practice in its whole complexity (if government does not declare it as an obligatory accounting format).

1 Docbook uses extended XLink

2 XLink DTD includes the extended element and attribute, so they are accessible using XPath.

3 XPath API should be able to process the extended XLink nodes

4 Microsoft and Apple platforms have XBRL tools, and IBM has best practices

References

• Docbook Release Notes

• Accelerating XBRL Adoption (pdf)