Subject: RE: [xsl] Request help in understanding: node instance of schema-element(node) From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Sun, 27 Jan 2008 10:28:50 -0000 |
> But I have a personal curiosity, related to Roger's question > in this thread. > > I would have preffered a syntax > > <xsl:value-of select="if (//test instance of > schema-element(test)) then > //test * 2 > else 'Error'"/> > > Without doing, <xsl:import-schema > schema-location="test.xsd"/> in the 2.0 stylesheet. Many of the benefits of schema-awareness come from being able to use the information at compile-time, to do static checking of the stylesheet and compile-time optimization. While it would be theoretically possible to do all checking at run-time, and thus to refer to type names whose meaning is not known until run-time, you would lose most of these benefits. Of course there are languages like Java that supplement compile-time type information with run-time introspection. I would certainly like it if XSLT were able to do introspection of the schema information at run-time. But there are a lot of debates about how this is best achieved. > Does Saxon-SA support > xsi:schemaLocation method as well (and I don't do -val / > -val:strict) ? If Saxon doesn't support xsi:schemaLocation > method, my curiosity is, why not? Saxon uses xsi:schemaLocation where appropriate to identify where a schema can be found. It doesn't use it as a signal to tell you whether validation is wanted or not. I don't think that is the intended purpose of xsi:schemaLocation, and I don't think it's a useful way of doing it - I think it's common for users to want validation even when there is no xsi:schemaLocation, or to want no validation even when there is an xsi:schemaLocation. To be honest, even though Saxon does use xsi:schemaLocation for the limited purpose of locating a schema once validation has been requested, I don't think it's a good idea to use it. If you are validating a document then that's probably because you don't trust it, and if you don't trust it, then why should you trust its schemaLocation attribute? Michael Kay http://www.saxonica.com/
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