Re: Style, Substance and Typing in Schemas

From: Michael Kay <mike@saxonica.com>
To: xml-dev@lists.xml.org
Date: Wed, 12 Oct 2011 12:29:16 +0100

Play the video

On 12/10/2011 11:21, David Lee wrote:

008101cc88c8$acb19e20$0614da60$@calldei.com" type="cite">

With absolutely NO knowledge whatsoever, I will take a poke in the dark.

Since in Java, URI is not a subclass of String, it make sense that anyURI in XSD should not be a subclass of String.

My argument would be: go to the definition of URI. RFC 3986 says

"A Uniform Resource Identifier (URI) is a compact sequence of
characters that identifies an abstract or physical resource."

That says a URI is a string with certain properties. So it should be modelled as a string in the schema (and should therefore inherit the properties and operations applicable to other strings). Just as xs:NCName is a string, so should xs:anyURI be.

That makes URIs different from dates, or integers, for example. One can argue that dates are not strings. If you go looking for a definition of dates, or integers, I think it's unlikely to say that dates/integers are sequences of characters.

But I have a lot of sympathy with Jeni Tennison's proposal for data types which says that everything is a string...

http://www.jenitennison.com/datatypes/DTLL.html

Michael Kay
Saxonica

References:
- Style, Substance and Typing in Schemas
  - From: "Toby Considine" <Toby.Considine@gmail.com>
- Re: Style, Substance and Typing in Schemas
  - From: Michael Kay <mike@saxonica.com>
- RE: Style, Substance and Typing in Schemas
  - From: "David Lee" <dlee@calldei.com>

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