[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: Style, Substance and Typing in Schemas

• From: Andrew Welch <andrew.j.welch@gmail.com>
• To: David Lee <dlee@calldei.com>
• Date: Wed, 12 Oct 2011 11:41:34 +0100

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

:) that doesn't stop me either...

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

That's probably (see above) because you don't want URI inheriting all
the methods in String.

>
> More abstractly, I could see the argument that anyURI by nearly coincidence is a string representation of a URI but really is its own structured type  (protocol + host + file part + query ... )  similar as one might say  a Point object could have a String representation "X,Y" but that doesn't make it a subclass of String, or even integer could be but isn't a subclass of string.
>

Yeah that seems reasonable... what I don't understand is why '' (empty
quotes) is a legal xs:string and xs:anyURI, when is that useful?
Every time I end up using xs:token or a custom 'non-empty-string'
type...



--
Andrew Welch
http://andrewjwelch.com

• Follow-Ups:
  • Re: Style, Substance and Typing in Schemas
    • From: John Cowan <cowan@mercury.ccil.org>

• 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>