[w3c sml][4807] Look at sections in section 5 and see if we can make them more clear

The section 5 in the title has now become section 6 : "Structured XML Output from Schematron Rules".

I propose that we should remove this section entirely rather than spending time fixing/clarifying it. There are a couple of reasons:

1.       Support for structured xml output is optional. It will be more productive to spend our time on core (non-optional) SML issues. If we have lot of time left after fixing all core issues, we can discuss whether to  bring this back.

2.       It is strange that the SML spec even attempts to define this. This should either be implementation dependent or should be the responsibility of the schematron spec to define.

Please let me know if you disagree.