在BPEL返回复杂类型响应

问题描述

基本上，我希望能够从BPEL ODE引擎生成具有复杂类型且元素数量不受限制的响应.这个想法非常基础，我得到一个对象列表作为输入，然后根据某个类别进行一些过滤.然后，我需要基于过滤来生成响应，该响应可能不止一个元素.但是BPEL副本分配仅允许一对一分配.我已经尝试使用数组，但似乎也无法分配给多个元素.下面的代码段同时用于输入和输出.

Basically I want to be able to generate a response from BPEL ODE engine with complex type that has an unbounded number of elements.The idea is very basic, I get a list of objects as an input then I do some filtering based on a certain category. Then I need to generate response based on the filtering, which might be more than one elements. But the BPEL copy assignment only allow one to one assignment.I already try using array but can't seem to assign to more than one element also.The snippets below is for both the input and the output.

        <complexType name="hospitalType">
        <sequence minOccurs="1" maxOccurs="unbounded">
          <element name="patients">
          <complexType>
            <sequence>
              <element name="patient" minOccurs="1" maxOccurs="unbounded">
                <complexType>
                  <sequence>
                    <element type="string" name="name"/>
                    <element type="date" name="dob"/>
                    <element type="byte" name="age"/>
                    <element type="string" name="status"/>
                  </sequence>
                  <attribute name="pid" type="ID"/>
                </complexType>
              </element>
            </sequence>
          </complexType>
        </element>

到目前为止，以下是我尝试过的

So far the following is what I tried

       <bpel:copy>
                <bpel:from part="payload" variable="input">

                            <bpel:query queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath1.0">
                                <![CDATA[tns:patients/tns:patient[1]]]>
                            </bpel:query>
                        </bpel:from>
                <bpel:to part="inload" variable="output">

                            <bpel:query queryLanguage="urn:oasis:names:tc:wsbpel:2.0:sublang:xpath1.0">
                                <![CDATA[tns:patients/tns:patient]]>
                            </bpel:query>
                        </bpel:to>

        </bpel:copy>

如果输入中有多个元素，我什至无法做简单的分配.

I can't even do a simple assignment if the input has more than one element..

推荐答案

这是WS-BPEL的局限性.实现此目标的符合标准的方法是运行XSL转换.请参见 WS-BPEL规范的第65页.为了使操作更容易一些，ODE提供了几个XPath扩展，它们允许在列表中添加或插入元素.请参阅此处以获取列表.这样的分配示例如下:

This is a limitation of WS-BPEL. The standards compliant way to achieve this is to run an XSL tranformation. See page 65 of the WS-BPEL specification. To make this a little easier, ODE provides a couple of XPath extensions that allow for appending or inserting elements into a list. See here for a list. An example of such an assign looks as follows:

<assign>
  <copy>
    <from>ode:insert-after($parent, $parent/child::node(), $siblings)</from>
    <to variable="parent"/>
  </copy>
</assign>

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