- From: Innovimax SARL <innovimax@gmail.com>
- Date: Wed, 4 Apr 2007 17:49:39 +0200
- To: "Henry S. Thompson" <ht@inf.ed.ac.uk>
- Cc: "Norman Walsh" <Norman.Walsh@sun.com>, public-xml-processing-model-wg@w3.org
I share Henry's concern that depending on a step is too fuzzy But, depending on an input is something i feel necessary even for V1 In that case, you have to create accessory output (which will contain dummy (or not) things), and say in the *following* component that it depends on this output I know that some of the question raised by Henry remains unsolved, but we can pick one (say output has started to be produced) and stick to it The more, I think, the more I agree with Henry saying that Errors discussions should start first My two cents Mohamed On 4/4/07, Henry S. Thompson <ht@inf.ed.ac.uk> wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Nightmare! > > If I depend on a step, what does that mean? That I don't start until > it has started? Until it has finished? Until its output has > finished? What if it produces error output? What if it has multiple > outputs -- can I start once its primary output has finished? Will we > rule out explicit deadlock? Implicit deadlock (I use your input, you > depend on me)? > > What will you want next -- a guarantee that the db-query step will > read what the db-update step wrote, even in the presence of multiple > pipeline activations (i.e. atomicity)? > > Maybe we should delay discussing this until we've discussed errors, > because if we end up providing some kind of transaction support, some > of these problems will go away and/or be given useful background. > > My inclination for v1 is to just say "no dependency mechanism", and > for now that you should build your db-update step to provide some form > of trivial output, e.g. > <my:wroteRecords n="3"/> > , and ignore it if you don't need it, but use it to sequence > subsequent steps if need be (e.g. in this case by wrapping the 'query' > step in a p:for-each select='my:wroteRecords'. . .) > > ht > - -- > Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh > Half-time member of W3C Team > 2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440 > Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk > URL: http://www.ltg.ed.ac.uk/~ht/ > [mail really from me _always_ has this .sig -- mail without it is forged spam] > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.2.6 (GNU/Linux) > > iD8DBQFGE7JDkjnJixAXWBoRAmZPAJ9j/R09Zu3ceGcDY8I4XOHB+SRBcACfXMTc > 3RMq8UNqvSIqj9THUgCGIiE= > =hUjk > -----END PGP SIGNATURE----- > > -- Innovimax SARL Consulting, Training & XML Development 9, impasse des Orteaux 75020 Paris Tel : +33 8 72 475787 Fax : +33 1 4356 1746 http://www.innovimax.fr RCS Paris 488.018.631 SARL au capital de 10.000 €
Received on Wednesday, 4 April 2007 15:50:01 UTC