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-user&m=113819830006177&w=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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| |epcc|, The University of Edinburgh |
| King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK |
| Tel: +44 (0)131 650 6718 --- email: [EMAIL PROTECTED] |
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