Re: XML Schema language version

On Sep 26, 2013, at 2:58 AM, George Cristian Bina wrote:

> Hi all,
>=20
> We introduced XML Schema 1.1 support in oXygen some time ago. As there =
is no way to specify the version of the XML Schema language we added an =
application option that controls what version is in use. By default XML =
Schema 1.1 is selected and we show a notification to the user informing =
him that we use XML Schema 1.1 with two options:
> Continue with 1.1
> Switch back to 1.0
> After the user chooses one of these options this notification =
disappears and is not presented again, the user being able to change the =
XML Schema version from the oXygen preferences and even specify a =
specific value for each project.
>=20
> One problem we encountered with a number of users is that they choose =
to continue with XML Schema 1.1 and then they forget about this. They =
develop XML Schema 1.1 schemas and deploy them to users using XML Schema =
1.0 tools, without being aware that they are using XML Schema 1.1 =
features in their schemas.
>=20
> Not having a mechanism of setting the XML Schmea language version =
inside the schema file makes difficult working with XML Schema 1.0 and =
XML Schema 1.1 files in the same time.
>=20
> We can add of course an oXygen specific way of specifying the XML =
Schema language version required to process a specific XML Schema in the =
form of a PI or an annotation but it will be useful to see if there is =
more interest in having this functionality and then find a better way to =
specify and implement this so that people can use the same syntax and =
have that understood by more tools. Maybe a W3C Note will be a good =
choice for specifying this, similar to the xml-model PI for associating =
a schema with a document.

It certainly seems that the two decisions (a) not to put any version =
identifier
into an XSD 1.0 schema, and (b) not to change the namespace in XSD 1.1,
working together, were a mistake.

I believe the URIs specified in XSD 1.1 for denoting specific versions =
of=20
XSD should be useful here -- at least, they provide a standard way to =
say
things like "XSD 1.0" and "XSD 1.1".


--=20
****************************************************************
* C. M. Sperberg-McQueen, Black Mesa Technologies LLC
* http://www.blackmesatech.com=20
* http://cmsmcq.com/mib                =20
* http://balisage.net
****************************************************************