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At 2006-04-21 14:51 -0400, Schneider, John Adam CAR wrote:
>I'm deriving types from UBL, some of which have elements which are required
>by the specification.
Your problem isn't UBL related, it is an issue with the derivation
you are attempting.
>I would like to derive the element types using
>restriction, and use the derived types instead of the base types. For
>example, I'd like to derive MyLineItemType from restriction of the UBL
>LineItemType and use MyLineItemType as an element within MyOrderLineType,
>which is derived from a restriction of the UBL OrderLineType. However, when
>I do this, I get the following error from the JAXB xjc utility:
>
>[ERROR] rcase-RecurseLax.2: There is not a complete functional mapping
>between t
>he particles.
> line 20 of
>file:/D:/Documents%20and%20Settings/chgtg6h/workspace/Order%20Inter
>face/src/xsd/annotated/test/Child.xsd
>
>[ERROR] derivation-ok-restriction.5.4.2: Error for type 'ChildType'. The
>partic
>le of the type is not a valid restriction of the particle of the base.
> line 20 of
>file:/D:/Documents%20and%20Settings/chgtg6h/workspace/Order%20Inter
>face/src/xsd/annotated/test/Child.xsd
That is telling you that your restriction is invalid.
>Here are the Schema files which I am using to test my requirements:
>
>Parent.xsd:
>...
> targetNamespace="parent"
>...
> <xsd:element name="Element" type="ElementType"/>
>...
> <xsd:complexType name="ParentType">
> <xsd:sequence>
> <xsd:element ref="Element" minOccurs="1" maxOccurs="1"></xsd:element>
Okay ... so in parent:ParentType is made up of elements named
{parent}ElementType.
>Child.xsd:
>...
> targetNamespace="child"
>...
> <xsd:element name="Element" type="RestrictedElementType"
>...
> <xsd:complexType name="ChildType">
> <xsd:complexContent>
> <xsd:restriction base="parent:ParentType">
> <xsd:sequence>
> <xsd:element ref="Element" minOccurs="1"
Here you are indicating that the restricted content is made up of
elements named {child}ElementType.
>Why can't I do this?
Because these element names are in different namespaces, they are not
considered the same particle. So, an instance of your ChildType
type, which has {child}ElementType children, isn't a valid instance
of the {parent}ParentType you are deriving from.
>In this situation, the element "Element" in
>"ChildType" has a type which is valid derivation of the "ElementType" in my
>parent schema.
I don't see it as valid ... the child elements are in a different namespace.
>In the OO paradigm which I am familiar with, this is perfectly legal.
I think you are missing the namespace issue ... you've named your
child elements with a different namespace, which makes them different
even though the "local names" are the same.
>For example, here is essentially the same situation in Java:
I disagree ... the local names are the same, but in your W3C Schema
expressions you are using different namespaces, thus you are using
different qualified names.
I hope this helps.
. . . . . . . ken
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