OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.


Help: OASIS Mailing Lists Help | MarkMail Help

[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]
RE: [xml-dev] XML spec and XSD


If I understand correctly, in relaxNG, something like:

start = x

x = element x {
   ( a  & b? & c? & d? & e?) |
   ( a? & b  & c? & d? & e?) |
   ( a? & b? & c  & d? & e?) |
   ( a? & b? & c? & d  & e?) |
   ( a? & b? & c? & d? & e )

a = element a {empty}
b = element b {empty}
c = element c {empty}
d = element d {empty}
e = element e {empty}

does what you want, it validates


and invalidates


Hmmm...I must confess I didn't really explore the shorthand version of RNG--perhaps I should take a look at it.  That is effectively the same as the longhand way I was doing it, and while it doesn't strike me as particularly elegant, it at least takes up less space.


usually you can persuade yourself that 1,?,+,* is enough and leave cardinality checking to higher up the chain, but if you really need this, then powers of two come in handy:-)

y = element y { z,z,z16,z2}
z16 = z8,z8
z8  = z4,z4
z4  = z2,z2
z2  = z?,z?
z = element z {empty}


but invalidates instances with less than 1 or more than 20 zs.

LOL, well, it's a bit of a hack, but I suppose that works.  Still, it's nowhere near as clean and readable (and after all, readability is one of the big claims of RNG, from what I've seen) as XSD's minOccurs and maxOccurs.

Thanks for the response, David.  Hoping for more of this kind from others.

Doug Glidden
Software Engineer
The Boeing Company

[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index]

News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 1993-2007 XML.org. This site is hosted by OASIS