DRAFT Appendix E language contribution

On last week's call PFWG undertook to bring some appendix-language  
suggestions to WebCGM.

There are two files attached.  One is an edit of the whole appendix  
and a second provides
an alternate approach to E.4

This is not iron-clad but drafting contribution.  I may get comments  
from WAI CG as to how
to talk about the topic that you had described as "ALT-like  
attributes" and I termed "Required
text content."  There's a minor terminology rathole in this area.

By the way, I still need to learn if objects in CGM can nest.  Can an  
object contain other
objects?  If so then we should be able to capture the ToC hierarchy  
in layers and objects probably without
strain.  If not, we need to look at how we provide textual features  
on the drawing group
APS for aggregate objects.  Sounds like XCF but need your knowledge  
of the format.

Al