Re: [Bug 2876] Need to address versioning

Before looking at how to mark versions, and how different
versions may work together, I think it's important to look
at potential extensibility points: What are the things most
likely to be added or changed in the future? How can the
current stuff be defined so that e.g. future additions
create minimal impact (e.g. additions are just ignored
or have some default behavior)?

Regards,    Martin.


At 14:34 06/03/04, bugzilla@wiggum.w3.org wrote:
 >
 >http://www.w3.org/Bugs/Public/show_bug.cgi?id=2876
 >
 >
 >
 >
 >
 >------- Additional Comments From ysavourel@translate.com  2006-03-04 05:34
 >-------
 >There are two main ways to add version information to ITS:
 >
 >#1 As a version number in the ITS namespace URI. This technique has several
 >drawbacks and is usually not used in other W3C markups. There are a few
 >exceptions, for example: SMIL.
 >
 >#2 As a version attribute. This method seems more efficient and is usually the
 >one used at the W3C, for example: SVG and XSLT.
 >
 >In the case of ITS there is one issue that creates some complications. ITS
 >elements can be scattered in a set of documents, and some ITS constructs are
 >made only of attributes. In other words, a processor could possibly have to
 >handle ITS blocks that have different versions.
 >
 >For example, an ITS processor could find ITS markup:
 >- in a schema file
 >- in a standalone ITS document
 >- in <documentRules> elements within a document
 >- in elements of the host documents (ITS local attributes)
 >
 >The first question is: Shall ITS allow this?
 >
 >I assume do have to, since someone may have control over the document
 >instances without having control over the schema or an external documentRules
 >(and conversely).
 >
 >I would propose to use an its:version attribute declared in the root element
 >of the document where the ITS namespace is used. This would give us for
 >example, for an host document:
 >
 ><myDoc xmlns="myDocURI"
 > xmlns:its="http://www.w3.org/2005/11/its"
 > its:version="1.0">
 >...
 > <its:documentRules>
 > ...
 >
 >And (for standalone ITS documenrRules):
 >
 ><its:documentRules
 > xmlns:its="http://www.w3.org/2005/11/its"
 > its:version="1.0">
 >...
 >
 >We would have the technical possibility to have one version attribute in the
 >root and another is a documentRules. I'm not sure how to prevent this (and
 >validate the prevention).
 >
 >The other question is that we may have conflicts between the versions if we
 >change how precedence are handled.

Received on Monday, 6 March 2006 07:11:34 UTC