Hi,
Abstract types and substitution groups seem not to be well supported
in most web service machinery. Even if you find a supporting
platform, there may be interoperability problems if clients use other
platforms.
That's interesting. I wasn't aware of that.
You might have an easier time getting something like this
to work:
element name=sequence type=tns:Workflow/
element name=parallel type=tns:Workflow/
element name=pipeline type=tns:Pipeline/
complexType name=Workflow
choice maxOccurs=unbounded
element ref=sequence/
element ref=parallel/
element ref=pipeline/
/choice
/complexType
complexType name=Pipeline
...
/complexType
This is a far more elegant way of writing the schema, I agree - it's what
I originally used. Unfortunately, WSDL2Java (Axis 1.4) doesn't seem to
support the maxOccurs attribute on a choice element. The beans don't
reflect it, there's only one member in the Java bean for each of the
subelements.
It is a complicated problem. Since the sequence, parallel and
pipeline elements can occur in any order and multiplicity the bean would
have to provide a List containing those objects. But then those objects
need to be cast to the correct types ...
This is why I tried to use substitutionGroups.
Is there any other way of solving the problem? I hope I was wrong and it's
possible to generate beans for the choice maxOccurs=unbounded ...
solution.
Amy
On 1/29/07, Amy Krause [EMAIL PROTECTED] wrote:
Hi,
I'm having a very similar problem as described here:
http://marc.theaimsgroup.com/?l=axis-userm=113819830006177w=2
My schema is included below.
I'm trying to implement a composite pattern. There are three types derived
from an abstract type as follows:
Workflow (abstract)
/ |\
Parallel Sequence Pipeline
Both parallel and sequence elements must contain nested Workflow elements
(one or more of parallel, sequence or pipeline), whereas pipeline elements
cannot - they form the leaves of the workflow tree.
An example of a document would be:
perform
sequence
parallel
pipeline ... /pipeline
pipeline ... /pipeline
/parallel
pipeline ... /pipeline
/sequence
perform
In the schema I've defined an abstract Workflow element and elements
parallel, sequence and pipeline. These are substitution elements for the
Workflow element.
When I generate Java beans with WSDL2Java there is no trace of the
parallel and sequence elements. There is a Java class called Composite
which extends WorkflowComponent but there is no way of telling whether
this Composite object used to be a sequence or a parallel element. How can
I force Axis to generate Java beans corresponding to those elements?
Any help with this would be appreciated.
Thanks,
Amy
!-- root element --
xsd:element name=perform
xsd:complexType
xsd:sequence
xsd:element ref=tns:workflow/
/xsd:sequence
/xsd:complexType
/xsd:element
!-- work flow group and component --
xsd:element name=workflow abstract=true
type=tns:WorkflowComponent
/xsd:element
xsd:complexType name=WorkflowComponent
/xsd:complexType
xsd:element name=parallel
substitutionGroup=tns:workflow
type=tns:Composite/
xsd:element name=sequence
substitutionGroup=tns:workflow
type=tns:Composite/
xsd:complexType name=Composite
xsd:complexContent
xsd:extension base=tns:WorkflowComponent
xsd:sequence
xsd:element ref=tns:workflow maxOccurs=unbounded/
/xsd:sequence
/xsd:extension
/xsd:complexContent
/xsd:complexType
xsd:element name=pipeline
substitutionGroup=tns:workflow
type=tns:Pipeline/
xsd:complexType name=Pipeline
xsd:complexContent
xsd:extension base=tns:WorkflowComponent
xsd:sequence
xsd:element ref=tns:activity minOccurs=1
maxOccurs=unbounded/
/xsd:sequence
/xsd:extension
/xsd:complexContent
/xsd:complexType
xsd:element name=activity
!-- some definitions here ... --
/xsd:element
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| Dr Amy Krause Applications Consultant |
||epcc|, The University of Edinburgh |
| King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK |
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