The referenced element is undefined

[Timo Nentwig]

Hi!

I'm new to XML schemas; can somebody explain why bar is undefined?

<xs:element name="bar">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="id" type="xs:string" use="required" /> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element>

<xs:element name="foo">
<xs:complexType>
<xs:sequence>
<xs:element ref="bar" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>

 

[Priscilla Walmsley]

Hi,

It's probably a namespace issue. If your schema has a target namespace, you need to either

1. Make that namespace the default namespace, as in:

<xs:schema targetNamespace="xxx" xmlns="xxx" ....

OR

2. Give that namespace a prefix, and use the prefix in the element reference, as in:

<xs:schema targetNamespace="xxx" xmlnsre="xxx"
....

<xs:element ref="pre:bar" maxOccurs="unbounded"/>

Hope that helps,
Priscilla

 

[Timo Nentwig]

It's probably a namespace issue. If your schema has a target namespace, you need to either

So the schema (Listing 2) at
http://www-106.ibm.com/developerworks/xml/library/x-pracdb2.html?ca=dnt-520 isn't valid at all?

I actually tried it with an example schema included in the Apache JaxMe distribution which has this definition:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="EN" targetNamespace="http://ws.apache.org/jaxme/examples/misc/address" elementFormDefault="qualified" attributeFormDefault="unqualified">

 

[Priscilla Walmsley]

So the schema (Listing 2) at

http://www-106.ibm.com/developerworks/xml/library/x-pracdb2.html?ca=dnt- 520 isn't valid at all?

No, I said "If your schema has a target namespace". That one's fine because it doesn't have a target namespace.

The second example you gave me:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="EN" targetNamespace="http://ws.apache.org/jaxme/examples/misc/address" elementFormDefault="qualified" attributeFormDefault="unqualified">

Using this schema, because it DOES have a target namespace, you DO need a namespace declaration for the target namespace BUT ONLY IF you are planning to reference other components (e.g. element ref="xxx:bar").

If you show me your whole schema I can probably explain better...

Priscilla

 

[Timo Nentwig]

If you show me your whole schema I can probably explain better...

Got it working thanks. Watch out for another posting of mine