Nodes appears depending on a condition

[Manresa]

Hi everyone,

First of all, excuses for my english.

I'm trying to build a XSD schema for this XML:

<root>
<error>0</error>
<result>
<result1></result1>
<result2></result2>
</result>
</root>

and another example

<root>
<error>1</error>
</root>

with this RESTRICTIONS:

· Node error appears always expecifying the error if there is an error
(value different to 0) or not (error equals to 0).
· Only if there is not error (node error = 0) node "result" appears.

Any idea?

(Schemas i've tried get "ambiguous error")

THANKS FOR YOUR HELP !!!

[Manresa]

Hi Oleg,

First of all ... thank u for your interest.

I think it's probably to find a "trick" to express this condition ...
something like:

<xs:element name="root">
<xs:complexType>
<xs:choice>
<xs:group ref="noError"></xs:group>
<xs:group ref="error"></xs:group>
</xs:choice>
</xs:complexType>
</xs:element>

<xs:group name="noError">
<xs:sequence>
<xs:element name="error" type="xs:unsignedByte" fixed="0"></xs:element>
<xs:element name="results">
<xs:complexType> ...... <xs:complexType>
</xs:element>
</xs:sequence>
</xs:group>

<xs:group name="error">
<xs:sequence>
<xs:element name="error" type="xs:unsignedByte"></xs:element>
</xs:sequence>
</xs:group>
This schema gets a "ambiguous error" due to "error" node.

I'm trying to find something similar to this to resolve my problem
"Oleg Tkachenko" <oleg@NO_SPAM_PLEASEtkachenko.com> escribió en el mensaje
news:eO**************@tk2msftngp13.phx.gbl...
Manresa wrote:

· Only if there is not error (node error = 0) node "result" appears.

Any idea?

Xml Schema unable to express co-occurence constraints like this one. Try
another schema language or redesign your XML.
--
Oleg Tkachenko
http://www.tkachenko.com/blog
Multiconn Technologies, Israel

[Manresa]

Hi Oleg,

I agreed with you ... but there is a problem. A applications sends to my
programs XMLs following this structure and it's not possible to change the
way they do. I have to build the schema for a documentation task of the
project.

Finally i think i will describe the constraint in a annotation node and go
on.

Thanks a lof for you interest
"Oleg Tkachenko" <oleg@NO_SPAM_PLEASEtkachenko.com> escribió en el mensaje
news:u5**************@tk2msftngp13.phx.gbl...

Manresa wrote:

I think it's probably to find a "trick" to express this condition ...
Yeah, you can do that trick, but that mekes your schema ambiguous. Why

don;t you instead to design you XML in a more simple, reasonable and structured way - either error or result elements may occur, but not together?
<results>
<error>2</error>
</results>

<results>
<result1>...</result1>
</results>
--
Oleg Tkachenko
http://www.tkachenko.com/blog
Multiconn Technologies, Israel