err:XD0002 vs. err:XD0011 vs. err:XD0029

There seems to be an overlap between the following three dynamic errors:

err:XD0002
It is a dynamic error if the processor attempts to retrieve the URI
specified on a p:document or p:data and fails.

err:XD0011
It is a dynamic error if the resource referenced by a p:document element
does not exist, cannot be accessed, or is not a well-formed XML
document.

err:XD0029
It is a dynamic error if the document referenced by a p:data element
does not exist, cannot be accessed, or cannot be encoded as specified


I would say err:XD0002 is not really necessary.

Regards,
Vojtech