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Re: [xml-dev] RELAX question re: required value

Hi Mike,

Embedded Schematron works a lot easier if you use Relax NG with the XML syntax.

Best Regards,
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger

On 1/23/14, 5:27 PM, Michael Sokolov wrote:
I found it a little tricky hunting down the proper syntax for this, so
for posterity here is an example of a embedding a schematron assertion
in Relax NG Compact:

             [sch:rule [context="meta"
                 sch:assert [ test="count(collection[.='all']) = 1"
                     "all collection must be present"]]]]

         element collection {

Thanks, John, for the pointer - this is exactly what I needed.


OK so for posterity, in case any
On 01/22/2014 02:14 PM, Michael Sokolov wrote:
I didn't know about the embedding of Schematron rules; sounds very
useful: thanks!


On 01/22/2014 01:11 PM, John Cowan wrote:

On Wed, Jan 22, 2014 at 11:30 AM, Michael Sokolov
<mailto:msokolov@safaribooksonline.com>> wrote:

    I have a schema that allows a bunch of different elements to be
    interleaved in any order; one of them is <collection>;  I want to
    require that a collection with value "all" be present, as well as
    allowing any number of other collections, in any order, using
    RELAX -- is that possible?

No, it isn't.  It would have to be element collection {"all"} &
element collection {text}, and it is forbidden to have the same
element name on both sides of &.  This is one of the few arbitrary
restrictions in RNG.  Even that formulation, if it were legal, would
allow more than one "all" collection, since there is no way to say
"everything but 'all'" in RNG.

However, this is a perfect application for an embedded Schematron
rule asserting that count(collection[text() = "all"] = 1.  Jing
supports embedded Schematron 1.5 rules quite nicely.

GMail doesn't have rotating .sigs, but you can see mine at

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