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Subject: QUESTION: what if picseqno is not 1?

Ref:  http://lists.oasis-open.org/archives/cgmo-webcgm/200509/msg00093.html
Comments:  21

Not a big issue, but it's undefined and there are a couple of possible ways 
to go with it...

QUESTION:  what if picseqno in a WebCGM fragment is greater than 1?

DISCUSSION:  For 'pictseqno' in, Dieter suggests to append,
"If the metafile does not contain a picture with the specified picture 
sequence number, the first (and only) picture in the metafile is chosen."

This is borrowed directly from the similar wording for 'pictid'.  There are 
a couple of things about it that bother me.  Firstly, in a WebCGM instance, 
more than one picture is an error and that restriction ("1") is hardwired 
into the EBNF for pictseqno.  So ... why are we defining a fallback for a 
hard error condition in the fragment?  (We typically don't do that, do we?)

One might reply, "...guidance for multi-picture cascaded profiles".  But 
WebCGM 1.0 said this, for pictseqno, "If pictseqno exceeds the number of 
pictures in the metafile, the last picture is displayed."




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