Request: more SGML restriction explanations

[Simon North]

Please accept my apologies if these are non-developmental questions, 
and my heartfelt thanks to all that have answered my earlier 
question. 

I am trying to establish a few points and would appreciate some 
enlightened answers ... 

1. Is <!ENTITY #DEFAULT ""> allowed? This was really useful SGML 
and would probably be pretty handy in XML. 

2. Are MS, MD, STARTTAG and ENDTAG forbidden in declarations?

3. What exactly is meant by "no attribute value specs on ENTITY 
declarations"? 

4. I'm not allowed data attributes on NOTATIONs, and I'm not allowed 
name groups in ATTLISTs, but can I cheat and use the following:

    <!ATTLIST #NOTATION element_name attribute_name attribute_spec> 

or would this be illegal too? Could I get rouind it by using a data 
attribute spec?


Thanks in advance, 

Simon North



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