RE: MCE Revision Issue: §6, "Overview"

John Haug johnhaug at
Tue Jul 23 23:24:30 CEST 2013

Good comment.  What I think I was getting at was that consumers that don't understand the extension can safely ignore it.  The ext definition in SpreadsheetML requires preserving unknown extensions (18.2.7), the ones in PresentationML ( and DrawingML (, don't.

Perhaps the best thing for Part 3 is to omit that last sentence.  That paragraph is intended to give a rough informative overview of the features in MCE, so saying anything about how they work (as opposed to generally what they do) is probably not a good idea.


From: Francis Cave [mailto:francis at]
Sent: Monday, July 22, 2013 3:50 PM
To: 'SC 34 WG4'
Subject: RE: MCE Revision Issue: §6, "Overview"

The edits to §6 Overview are mostly OK, I think, but I'm concerned about the wording of the final bullet point. Here it is with the changes applied:

"Application-defined extension elements specify a method for defining extensibility points within the markup specification. This allows markup producers to introduce new features scoped to particular elements within the markup specification. Markup Consumers can disregard these self-contained blocks of additional features."

I think that the first two sentences are OK, but the final sentence looks wrong to me. Markup Consumers MAY be able to disregard these extension elements, but only if the markup specification permits a Consumer to disregard them. The way that ext is specified in Part 1 means that it must be preserved if not understood, so they may never be disregarded. See Part 1 §18.2.7.


From: Rex Jaeschke [mailto:rex at]
Sent: 22 July 2013 18:46
To: SC 34 WG4
Subject: MCE Revision Issue: §6, "Overview"

A few days ago, I posted to this email list, WG N 0264, "29500-3 (MCE) Revision, WD0.91". It contains proposed changes by John H. based on an action item he took at the Bellevue F2F meeting. This action item was:  Rework this so we don't appear to be introducing any new terms. Use plain English.

Please post your feedback to this list. If we get enough support, we'll close this issue on the next teleconference; otherwise, we'll deal with it at the Delft F2F meeting.

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