Re: [xml-dev] Announce: XML Schema,

[John Cowan <jcowan@reutershealth.com>]

Thomas B. Passin scripsit:

> You also do not have a hope of getting the WXS schema right without a tool
> to help, at least not for one with any complexity.  I'm not sure if the same
> is true for RelaxNG.  John?  What do you say?

Well, what counts as a tool?  I certainly run every RNG schema that I
write through Jing in its schema-checking mode (just don't specify any
document to validate), and generally find a typo or two and sometimes
a violation of an RNG rule, generally of the paper-bag variety.

But I write them all in a plain text editor with no special support.
If I were writing XML-syntax schemas, I would certainly use
Henry Thompson's wonderful XED editor, which is basically a plain text
editor that forces the document to be well-formed.

OTOH, when developing my complete XLink schema (which validates a
document if and only if it conforms to XLink) I had to do lots of
Jing passes until I got something that did what I wanted and
was semantically allowed.  But XLink is a very unusual schema
with extensive use of wildcards.

I'll publish it here just for s**ts and giggles.  There may be
undetected semantic problems, use at your own risk, I claim no
copyright.

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# RELAX NG schema for W3C XLink

datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes";
namespace xlink = "http://www.w3.org/1999/xlink";

href = attribute xlink:href {xsd:anyURI}
role = attribute xlink:role {xsd:anyURI}
arcrole = attribute xlink:arcrole {xsd:anyURI}
title.att = attribute xlink:title {text}
show = attribute xlink:show {"new"|"replace"|"embed"|"other"|"none"}
actuate = attribute xlink:actuate {"onLoad"|"onRequest"|"other"|"none"}
label = attribute xlink:label {xsd:NMTOKEN}
from = attribute xlink:from {xsd:NMTOKEN}
to = attribute xlink:to {xsd:NMTOKEN}

simple = element * {
		attribute xlink:type {"simple"}, anyAttr*,
		href?, role?, arcrole?, title.att?, show?, actuate?,
		(anyElem | text)*
		}

extended = element * {
		attribute xlink:type {"extended"}, anyAttr*,
		role?, title.att?,
		(title | resource | locator | arc | anyElem | text)*
		}

title = element * {
		attribute xlink:type {"title"}, anyAttr*,
		(anyElem | text)*
		}

resource = element * {
		attribute xlink:type {"resource"}, anyAttr*,
		role?, title.att?, label?,
		(anyElem | text)*
		}

locator = element * {
		attribute xlink:type {"locator"}, anyAttr*,
		href, role?, title.att?, label?,
		(title | anyElem | text)*
		}

arc = element * {
		attribute xlink:type {"arc"}, anyAttr*,
		arcrole?, title.att?, show?, actuate?, from?, to?,
		(title | anyElem | text)*
		}

start = element * { anyAttr*, (simple | extended | anyElem)* }

anyElem = element * {anyAttr*, (anyElem | text)*}

anyAttr = attribute * - xlink:*  {text}

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-- 
John Cowan <jcowan@reutershealth.com>     http://www.reutershealth.com
I amar prestar aen, han mathon ne nen,    http://www.ccil.org/~cowan
han mathon ne chae, a han noston ne 'wilith.  --Galadriel, _LOTR:FOTR_