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Subject: Updated summary: task vs. general task, constraints, conref, and other related issues
Here is another
updated summary of the issues related to task vs. general task, constraints,
conref, and other related matters. The
summary is also available as a Wiki
page under the “Working Documents, DITA 1.2” section of the DITA TC Wiki page. I’ve
placed the issues into two groups. The first group includes questions that
still need to be resolved. The second group includes issues that I believe have
been resolved or deferred. If I’ve
left anything out or there are other questions that need to be discussed and
decided, please add them to the list. Robert
wrote an FAQ about constraints that everyone who is interested in this topic
should read:
http://wiki.oasis-open.org/dita/ConstraintsFaq
Open
questions: 1. There was a preliminary proposal to
allow “weak” constraints to be declared. Michael formalized this as a
proposal to allow both “strong” and “weak” constraints validation with “weak”
being the default. No one raised technical complaints about the original proposal.
There has been support for including the proposal as part of DITA 1.2 expressed
by several people. There have been reservations about considering the proposal
this late in the DITA 1.2 cycle. If the strong/weak constraints proposal goes
forward, my assumption is that we will use the default of “weak” in task.dtd
and in ditabase.dtd. The proposal requires changes to the written specification,
but no changes to the DTDs or XSDs. It may require changes to some implementations,
but perhaps not difficult or extensive changes. Proposal: Accept Michael’s proposal for DITA
1.2 with “weak” conref validation of constraints as the default and “strong”
conref validation of constraints something that may be implemented, but is not
required.. 2. There is an open question about the
need to include a second ditabase doctype shell that would include general task
rather than strict task. The TC seemed to be leaning toward not including
a second ditabase doctype shell, but I don’t think there is a consensus about
that and a final decision remains to be made. If a decision is made to
include a second ditabase, we would need to pick a location for the additional
doctype shell, filenames, a Public ID, and a URI, and the DTDs, XSDs, and the
DITA specification would all need to be updated. Proposal: Include only a single ditabase
document type in DITA 1.2. 3. The names we have for task.dtd,
generalTask.dtd, task.mod, task.ent, strictTaskbodyConstraint.mod and the
associated XSDs, Public IDs, and URIs seem confusing. Would new names for
some of the these items help? task.dtd might become strictTask.dtd,
task.mod --> genTask.mod, task.ent --> gentask.ent. For compatibility
with DITA 1.1 and 1.0 we’d probably need to use the same sort of trick we used
with glossary and glossentry, so the old names would continue to work. Proposal: To make some name changes so that
it is clearer what each file includes or does. 4. Any user specializations based on
task.mod from DITA 1.0 or 1.1 will switch from being strict to general task
based specialization when people move to DITA 1.2 unless explicit action is
taken to add the strict task constraint to the specialization. This is pretty
much want happened to use with ditabase.dtd. We need to add something to the
DITA 1.2 specification warning people about this possibility. Or, if we rename
some items as suggested in the previous item, we might be able to avoid this
problem by having a genTask.mod, a strictTask.mod, and a task.mod where
task.mod would include the strict task constraint. Proposal: To make a change along the lines of
the later suggestion, so that previously existing specializations based on task.mod
include the strict task constraint and so do not implicitly change when used with
DITA 1.2. Issues
that I believe have been resolved or which have been deferred to DITA 1.3 or
2.0: 5. The TC has decided that strict task
rather than general task should be included in the ditabase doctype shell that
is included as part of Technical Content. DTDs, XSDs, and the DITA 1.2
specification will all need to be updated. 6. Questions were raised about the
constraints mechanism in general and if it was appropriate to use it to
implement the new versions of task that are part of DITA 1.2. At the TC
meeting two weeks ago Joann made a proposal to abandon the current approach of
using constraints to implement general and strict task in DITA 1.2. As an
alternative she suggested two peer task specializations both based on topic.
Others suggested that implementing strict task as a specialization of general
task without using constraints as another approach. After a good deal of
discussion, it was decided that we should stick with the current approach of
using constraints to implement strict task based upon general task. 7. It has been stated that within a
single organization or within a single authoring group, that in general only
one version of an information type SHOULD be used within a group and that we
should explain why that is the case and recommend that approach somewhere in
the DITA 1.2 specification as well as in a best practices document that might
be written by the DITA Adoption TC. There were a number of questions
about exactly what should be said and where it should be said, but there was
agreement that something should be said in both the DITA specification and in a
best practices document. 8. There was a question about the wisdom
of including both task.dtd (strict task) and generalTask.dtd in the DITA 1.2. Given
the previous item we will include both with appropriate warnings and
recommendations in the specification and a best practice. 9. There was a lot of discussion about
what is and isn’t or what should and shouldn’t be valid when using conref.
There was one question about doing conref validation based on content models in
DTDs or XSDs rather than information in the domains attribute value.
Several people pointed out why DITA doesn’t use the actual content models in
the DTDs or XSDs for conref validation and instead uses values from the domains
attribute. 10. Many of the issues we’ve been
discussing seem to arise from shortcomings of ditabases and shortcomings of
DTDs --that a ditabase can only contain a single use (constrained or
unconstrained) of a particular info type. We should look for ways to
remove or relax these restrictions in DITA 1.3 or 2.0. 11. Eliot added some questions about topic
nesting, conref validation, and the domains attribute to the list of things to
consider for DITA 1.3. |
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