[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] FW: content: sequence?
The following is a message to the RDF working group regarding sequence in RDF. This led to some subsequent discussion in which I argued that if sequence is a generally useful concept, 3a is the best answer. We also discussed the relative merits of indicating sequence on the containing element vs. the contained. --Andrew Layman AndrewL@m... > -----Original Message----- > From: Andrew Layman > Sent: Monday, August 04, 1997 2:55 PM > To: w3c-labels-wg@w...; w3c-dsig-collect@w... > Subject: RE: content: sequence? > > We did not reach agreement on how best to handle sequence in Boston, > though we did agree that there are times in RDF when sequence is > significant and other times when it is not. We discussed the > possibility of having an attribute on an element signalling to an > application when it could ignore sequence. This was generally agreed > to as a direction, but we did not agree on what the appropriate > default should be. > > There were three approaches discussed: > > 1. a. Sequences are always important on some (tbd) elements > (e.g. "list") and never on others. > b. Sequences are not important on some (tbd) elements (e.g. > "ablock"), but are significant on all others. > > 2. Sequence-significance could be indicated by an attribute, > required on elements defined by RDF, and presumably unavailable on > other elements. > > 3. Sequence-significance could be indicated by an attribute that > can be used on any element. If omitted, and if no default was given in > a schema, then > a. The application should follow the XML precedent > of treating sequence as significant (after all, it might be). > b. The application should treat sequence as > insignificant (after all, that takes less processing). > > Separately, we briefly discussed whether sequence-significance should > be lexically inherited, but this dissolved into the general difficulty > of lexical inheritance. > > By my calculation, the only options fully compatible with XML without > implying any sort of contextual processing or lexical inheritance are > 1a, 2 and 3a. > > --Andrew Layman > AndrewL@m... > > -----Original Message----- > From: Tim Bray [SMTP:tbray@t...] > Sent: Saturday, August 02, 1997 12:15 PM > To: w3c-labels-wg@w...; w3c-dsig-collect@w... > Subject: content: sequence? > > The draft does not, unless, I missed it, allow for sequence in the RDF > model. This is going to be widely required in all sorts of classes of > metadata (examples on request). I don't think RDF 1.0 is worthwhile > without > sequence. > > Suggestion: RDF already has a list primitive. If I say > > <list id="l001"> > > <item>Panorama</item><item>Navigator</item><item>Notepad</item></list> > > <ablock href="http://...somewhere..."> > <AppToOpenWith href="#l001" reftype="indirect"> > </ablock> > > then I think we have a sequenced property value. Does this work? > > Cheers, Tim Bray > tbray@t... http://www.textuality.com/ +1-604-708-9592 xml-dev: A list for W3C XML Developers Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To unsubscribe, send to majordomo@i... the following message; unsubscribe xml-dev List coordinator, Henry Rzepa (rzepa@i...)
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