schema, attributes, interdependent restrictions

[Marc Hebert]

I'm trying to figure out if something is possible to specify and
constrain using a schema. I'll explain using an example.

sample xml:
<person name="John" age="32"/>
<person name="Julie" age="25"/>

In my schema, I'd love to be able to place different restrictions on
the attribute 'age' based on the value of 'name'... so in this
example, I might want to enforce that any entry where name="John"
includes an age attribute that falls between 30-39, and that Julie's
age value is 20-29.

What I tried to do, and is invalid, is define a JohnPerson and
JuliePerson element type, and then specify that I expected a list
(all) of elements having an element name="person" and
type="JohnPerson", "JuliePerson", etc... by the parser rejected that
with "Multiple elements with name 'person', with different types,
appear in the model group."

Any ideas?

Many thanks,
Marc

[Bjoern Hoehrmann]

* Marc Hebert wrote in comp.text.xml:

>I'm trying to figure out if something is possible to specify and
constrain using a schema. I'll explain using an example.

sample xml:
<person name="John" age="32"/>
<person name="Julie" age="25"/>

In my schema, I'd love to be able to place different restrictions on
the attribute 'age' based on the value of 'name'... so in this
example, I might want to enforce that any entry where name="John"
includes an age attribute that falls between 30-39, and that Julie's
age value is 20-29.

This is not possible with XML Schema 1.0. You could check out NVDL (with
multiple XML Schema schemas), RELAX NG, and Schematron (possibly XML
Schema with embedded Schematron), none of which will work in simple XML
Schema 1.0 implementations of course.
--
Björn Höhrmann · mailto:bj****@hoehrmann.de · http://bjoern.hoehrmann.de
Weinh. Str. 22 · Telefon: [phone] · http://www.bjoernsworld.de
68309 Mannheim · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/

[Marc Hebert]

On May 23, 7:43 pm, Bjoern Hoehrmann <[e-mail]:

* Marc Hebert wrote in comp.text.xml:

I'm trying to figure out if something is possible to specify and
constrain using a schema. I'll explain using an example.

sample xml:
<person name="John" age="32"/>
<person name="Julie" age="25"/>

In my schema, I'd love to be able to place different restrictions on
the attribute 'age' based on the value of 'name'... so in this
example, I might want to enforce that any entry where name="John"
includes an age attribute that falls between 30-39, and that Julie's
age value is 20-29.

This is not possible with XML Schema 1.0. You could check out NVDL (with
multiple XML Schema schemas), RELAX NG, and Schematron (possibly XML
Schema with embedded Schematron), none of which will work in simple XML
Schema 1.0 implementations of course.
--
Björn Höhrmann · mailto:[e-mail] ·http://bjoern.hoehrmann.de
Weinh. Str. 22 · Telefon: [phone] ·http://www.bjoernsworld.de
68309 Mannheim · PGP Pub. KeyID: 0xA4357E78 ·http://www.websitedev.de/

Thanks very much for that info, that saves me a few hours of trying to
do something impossible.

Marc

[hugo]

test
"Marc Hebert" <he*********@gmail.comwrote in message
news:55**********************************@34g2000h sh.googlegroups.com...

>
I'm trying to figure out if something is possible to specify and
constrain using a schema. I'll explain using an example.

sample xml:
<person name="John" age="32"/>
<person name="Julie" age="25"/>

In my schema, I'd love to be able to place different restrictions on
the attribute 'age' based on the value of 'name'... so in this
example, I might want to enforce that any entry where name="John"
includes an age attribute that falls between 30-39, and that Julie's
age value is 20-29.

What I tried to do, and is invalid, is define a JohnPerson and
JuliePerson element type, and then specify that I expected a list
(all) of elements having an element name="person" and
type="JohnPerson", "JuliePerson", etc... by the parser rejected that
with "Multiple elements with name 'person', with different types,
appear in the model group."

Any ideas?

Many thanks,
Marc