- From: Norman Walsh <ndw@nwalsh.com>
- Date: Sat, 20 Sep 2008 14:52:32 -0400
- To: James Garriss <james@garriss.org>
- Cc: XProc Dev <xproc-dev@w3.org>
- Message-ID: <m2k5d6645r.fsf@nwalsh.com>
James Garriss <james@garriss.org> writes: > I guess I'm trying to figure out what "binding" means. 3.5 Associating Documents with Ports [Definition: A binding associates an input or output port with some data source.] Unfortunately, I see that we use the word binding for variable/option/parameter bindings as well, so I think maybe a little editorial work is needed. > Is there no > difference between declaring an output port and binding it? IOW, is this > binding? The situation is, unfortunately, a little bit complicated and subtle. On p:declare-step, p:output is a declaration. On a compound step (p:group, for example), it is *both a declaration and a binding*. If you don't specify a binding, then it gets a default binding (based on the primary output port of the last step in its subpipeline). If p:output was allowed on atomic steps, it would be only a binding, just like p:input on atomic steps is only a binding. But p:output is not allowed on atomic steps, so that case never arises. > It seems (to me) that it should be ok simply to declare that an output port > exists, so long as I don't attempt to bind it with a p:pipe. It's ok to declare it on p:declare-step; on a atomic step, it's *already been declared* by the p:declare-step that declares that atomic step! > Appreciating all the help! I appreciate the questions! By the time you've been working on a specification for a year or more, it becomes *very hard* to tell what parts users are going to understand and what parts they're going to find confusing. You're helping us a lot! I do plan to write some tutorial/how to docs eventually and these questions will be a big help. Be seeing you, norm -- Norman Walsh <ndw@nwalsh.com> | Reason's last step is the recognition http://nwalsh.com/ | that there are an infinite number of | things which are beyond it.-- Pascal
Received on Saturday, 20 September 2008 18:53:18 UTC