12:55:19 RRSAgent has joined #htmltf 12:55:19 logging to http://www.w3.org/2006/10/23-htmltf-irc 12:55:27 Meeting: RDFa Task Force 12:55:44 rrsagent, please make this record public 12:56:10 Previous: 2006-10-16 http://lists.w3.org/Archives/Public/public-rdf-in-xhtml-tf/2006Oct/0047.html 12:56:27 Agenda: http://lists.w3.org/Archives/Public/public-rdf-in-xhtml-tf/2006Oct/0058.html 12:56:49 agenda+ Action Item Review 12:56:54 agenda+ Reification 12:57:02 agenda+ RDF Containers in RDFa 12:57:09 agenda+ State of Documents, Assignment of Work 13:00:29 EliasT has joined #htmltf 13:01:43 SW_SWD(rdfxhtml)9:00AM has now started 13:01:50 +Ralph 13:03:06 benadida has joined #htmltf 13:03:28 +Ben_Adida 13:06:58 Steven has joined #htmltf 13:07:06 zakim, dial steven-617 13:07:06 ok, Steven; the call is being made 13:07:07 +Steven 13:08:58 zakim, take up agendum 1 13:08:58 agendum 1. "Action Item Review" taken up [from RalphS] 13:09:09 [DONE] ACTION: Ben announce new URIs for editors' drafts to TF [recorded in http://www.w3.org/2006/10/16-htmltf-minutes.html#action04] 13:09:19 [DONE] ACTION: Elias summarize the reification discussion [recorded in http://www.w3.org/2006/10/16-htmltf-minutes.html#action11] 13:09:57 ACTION: Mark write examples/tests of striping support [recorded in http://www.w3.org/2006/10/16-htmltf-minutes.html#action10] 13:09:59 -- continues 13:10:07 ACTION: Ben update the issues list [recorded in http://www.w3.org/2006/09/19-htmltf-minutes.html#action08] 13:10:09 -- continues 13:10:13 ACTION: Ben start separate mail threads on remaining discussion topics [recorded in http://www.w3.org/2006/09/19-htmltf-minutes.html#action07] 13:10:16 -- continues 13:10:37 ACTION: Steven to put together sample XHTML2 doc with all mime type, etc.. [recorded in http://www.w3.org/2006/09/19-htmltf-minutes.html#action01] 13:10:49 -- continues 13:11:04 Steven: I work a bit on this each week; you can see changes 13:11:50 Steven: we've submitted a WWW2007 RDFa workshop proposal 13:12:12 MarkB_ has joined #htmltf 13:13:00 +??P9 13:13:05 zakim, i am ? 13:13:05 +MarkB_; got it 13:13:40 Mark: my action on striping examples is nearly ready to send out 13:13:45 EliasT has joined #htmltf 13:14:09 Ben: reminder; we've targetted 27 Oct as date for code and examples of new syntax 13:14:19 +Elias_Torres 13:14:47 ACTION: Elias start an FAQ [recorded in http://www.w3.org/2006/10/03-htmltf-minutes.html#action10] 13:14:55 -- in progress 13:15:01 Elias: just started it 13:15:18 http://www.w3.org/MarkUp/2006/xhtml2.xml 13:15:34 ^ sample XHTML2 document 13:15:55 Steven: at the moment it is intentionally served as text/html 13:16:00 ... http://esw.w3.org/topic/RDFa#FAQ 13:16:15 ... I will make a snapshot as .xhtml so it is served with the correct MIME type 13:16:18 s/text\/html/text\/xml/ 13:16:40 s|/html|xml| 13:17:13 move to next agendum 13:17:13 agendum 2. "Reification" taken up [from RalphS] 13:18:18 Mark: my impression after the discussion was that some of the problems were due to reification in a particular context 13:18:33 ... for what we need, the issue seems more clear 13:19:07 s/we need/RDFa needs/ 13:19:21 ... e.g. 'who said X' does seem to be clear 13:19:33 ... in the references that Elias cited 13:20:26 ... Dan's point is that he wants RDFa to be no more expressive than RDF/XML 13:20:47 ... so that all RDFa can be transformed to RDF/XML 13:21:08 Elias: I don't agree that it is clear how we can identify a triple 13:21:36 Mark: if it's not clear how to do this in RDF/XML then we don't need to do it in RDFa 13:22:04 Elias: by 'identify' I mean know whether it exists in a specific named graph 13:22:19 ... it's not clear how to say 'that triple' 13:22:40 ... the RDF spec is clear that reification is about identification, not about quoting 13:22:47 ... but we don't have a clear way to identify 13:23:10 Mark: but if RDF/XML hasn't solved the problem then RDFa can't solve it either 13:23:15 Elias: but we have documents 13:23:39 Mark: we can name some other type of Statement but we can't name an RDF triple 13:24:11 ... if we wanted to, we could say there is an xyz:Statement that has implicit information 13:24:43 ... but we'd still need some magic if there's no way to say that this maps to an rdf:Statement 13:25:07 Elias: RDF reification does not say that if you have the quad it implies the triple 13:25:33 ( http://www.w3.org/MarkUp/2006/xhtml2.xhtml is created ) 13:25:38 Mark: in terms of generation from RDF/XML that's the case 13:25:51 ... you're not supposed to assume that the original triple exists 13:26:12 ... but that doesn't prevent the other way around 13:26:23 ... RDFa could say the triple exists 13:27:56 Ben: we can start with some RDFa and specify what it means in RDF/XML 13:28:27 Note that asserting the reification is not the same as asserting the original statement, and neither implies the other. That is, when someone says that John said something about the weight of a tent, they are not making a statement about the weight of a tent themselves, they are making a statement about something John said. Conversely, when someone describes the weight of a tent, they are not also making a statement about a statement they made (since they may 13:29:39 ^excerpt from RDF spec 13:30:53 http://www.w3.org/TR/rdf-primer/#reification 13:31:39 Ben: but we can say that the dc:creator of the s/p/o quad is responsible for a triple asserted by that quad 13:32:28 Elias: we want to attach provenance to HTML documents, not to graphs 13:32:42 Ben: we know how to do that 13:33:11 ... e.g. a LINK or a META on a DIV can say who is the creator of that DIV 13:33:29 Mark: even without reification there is a question 13:33:39 ... on the one hand you're making statements about the DIV 13:33:59 ... on the other hand we're reusing it at a higher level to represent a bnode 13:34:09 Ben: but the bnode is just a local concept 13:34:29 Mark: to be consistent, the only thing you'd be making statements about is the DIV 13:35:00
13:35:02 ... similar issue to describing the car or the web page that describes the car 13:35:47 Elias: given a div with two classes, can we say that the two type statements were made by different creators? 13:35:57 Ralph: that seems a corner case 13:36:55 Mark: when we embed metadata in the document rather than have it standalone then we lose the ability to attach provenance to the metadata 13:37:27
13:37:27 Ben: we could add more to reify the class="foo bar" case if we really wanted to 13:37:36 foo 13:37:40 bar 13:37:43
13:38:00 Ben: that would be one way to think about it but this is still more than RDF/XML gives 13:38:17 ... but another way is to simply write the triple two times 13:38:41 Mark: 2 choices; 1. use reification as it is 13:38:58 ... we've agreed that you can't connect between the asserted triple and the quad 13:39:49 ... 2. say that the "RDF-ness" is not really in the document; explode the document, expand every property in the document so that the contents are all objects, etc. 13:40:17 ... then this exploded version is converted back 'down' to RDF/XML 13:40:54 ... method 2 makes things quite complicated 13:42:03 Elias: even if we go with method 1, there is still the question -- adding provenance to a DIV adds statements to multiple triples 13:42:20 ... and that DIV could become the object of some enclosing element 13:42:27
13:42:32 .. reification ... 13:42:33
13:43:00 Elias: if our granularity is the XML element the reification applies to two different things 13:43:21 Mark: I could just about live with this 13:43:54 ... but in the IPTC case, given the statement "Reuters says this article is about skiing. Reuters is 80% confident in this categorization." 13:44:24 ... and separately "BBC says this article is about skiing. BBC is 60% confident in this categorization." 13:44:35 Ben: but this is an RDF problem too 13:45:15 Elias: if rev="bar" was added later by a different person than rel="foo" ... 13:45:30 Ben: you're talking about multiple authors changing the same piece of HTML 13:46:29 Elias: don't confuse two things; an HTML element and ... 13:46:38 ... the HTML element can create many triples 13:47:12 Ben: I can understand that attaching a link to a DIV is attaching the link to every triple 13:47:25 ... this may not be the best practice, but that _is_ what the HTML says 13:48:11 13:48:11 13:48:11 13:48:11 13:48:15 Elias: Reuter's 80% confidence is not in the statement itself but that the category is skiing 13:49:03 ... if I add iptc:joke to the categories, the 80% should still only apply to skiing 13:49:29 Ben: but why do we need to support that? 13:50:20 Elias: I am also worried about the case where the LINK element participates in an enclosing rev property 13:51:11 Ben: we need to look at some tricky examples give this new proposal and make sure they turn out sort-of reasonable 13:51:42 Mark: now I'm having trouble seeing these examples as reification 13:52:10 ... I am reevaluating my earlier comments suggesting that n-ary relations were not what we wanted 13:52:50 ... the category/confidence example can be done with n-ary relatoins 13:53:17 ... IPTC used a LINK element to add a confidence 13:54:27 ... perhaps a way out of the provenance issue is to handle it at the HTML level 13:54:57 ... use an additional HTML element rather than adding properties [to an existing one] 13:55:26 ... I'm starting to see that an n-ary solution fits more cases than I'd originally thought 13:56:10 ... I will extract more examples from original IPTC documents 13:56:30 ACTION: Mark produce more examples of applicability of n-ary relations from IPTC documents 13:57:05 ACTION: Elias to send by email examples of HTML markup that could be problematic with reification 13:57:32 -Ralph 13:59:10 http://www.w3.org/TR/swbp-n-aryRelations/#useCase1 14:03:31 http://www.w3.org/People/Ivan/ 14:05:33 -Steven 14:05:34 -Elias_Torres 14:05:35 -Ben_Adida 14:05:36 -MarkB_ 14:05:37 SW_SWD(rdfxhtml)9:00AM has ended 14:05:38 Attendees were Ralph, Ben_Adida, Steven, MarkB_, Elias_Torres 14:06:51 EliasT has left #htmltf 14:34:07 benadida has left #htmltf 15:12:55 zakim, bye 15:12:55 Zakim has left #htmltf 15:13:01 rrsagent, please draft minutes 15:13:01 I have made the request to generate http://www.w3.org/2006/10/23-htmltf-minutes.html RalphS 15:13:11 rrsagent, bye 15:13:11 I see 7 open action items saved in http://www.w3.org/2006/10/23-htmltf-actions.rdf : 15:13:11 ACTION: Mark write examples/tests of striping support [recorded in http://www.w3.org/2006/10/16-htmltf-minutes.html#action10] [1] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-09-57 15:13:11 ACTION: Ben update the issues list [recorded in http://www.w3.org/2006/09/19-htmltf-minutes.html#action08] [2] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-10-07 15:13:11 ACTION: Ben start separate mail threads on remaining discussion topics [recorded in http://www.w3.org/2006/09/19-htmltf-minutes.html#action07] [3] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-10-13 15:13:11 ACTION: Steven to put together sample XHTML2 doc with all mime type, etc.. [recorded in http://www.w3.org/2006/09/19-htmltf-minutes.html#action01] [4] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-10-37 15:13:11 ACTION: Elias start an FAQ [recorded in http://www.w3.org/2006/10/03-htmltf-minutes.html#action10] [5] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-14-47 15:13:11 ACTION: Mark produce more examples of applicability of n-ary relations from IPTC documents [6] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-56-30 15:13:11 ACTION: Elias to send by email examples of HTML markup that could be problematic with reification [7] 15:13:11 recorded in http://www.w3.org/2006/10/23-htmltf-irc#T13-57-05