The BPEL spec only addresses copy operations. As such, the to-spec for the copy operation must result in a target node that exists. A TII -> EII copy operation will never result in the creation of a child element in the target node. The result will be the target element having a single child text node, not an element node.
What you have run into is a valid exception being thrown because your second copy operation is targeting a node that does not exist in the variable $_b. After the first copy operation, the contents of $_b are: <svc01:elemC/> You are attempting to copy $_c into a child of $_b that doesn't exist. For example: <svc01:elemC> <svc01:elemC/> <!-- This is the node you're targeting --> <scv01:elemC> The quote from the spec that you referenced pertains to the literal variant of the copy operation. With this variant, the from-spec must produce a single EII or a single TII. In your case, you are producing a single EII which is valid. Therefore it is not a TII -> EII copy operation, it's actually an EII -> EII copy operation. Your choices are (in no particular order): * initialize the entire target variable using the complete element in the literal from-spec * use extensions to dynamically create missing target nodes * use Xquery expressions in the from-spec to construct the complex variable dynamically in a simple EII -> EII copy op to update the whole variable or parts of it. On 4/6/09 4:19 AM, "ZHAO Wenfeng" <[email protected]> wrote: According to WS-BPEL(Version 2.0) specification, it seems that the "TII -> EII" type of copy can be used to initialize a complex variable - at least to create its first children. The section "8.4.2. Replacement Logic of Copy Operations" says(P.70): "To replace the destination content: If the destination is an EII, all [children] properties (if any) are removed and the source content TII is added as the child of the EII. " But ODE 2.0 seems not to comply with it because in my case the assignment: <copy> <from><literal><svc01:elemC xmlns:svc01="http://example.com/service01.wsdl"/></literal></from> <to>$_b</to> </copy> <copy xmlns:svc01="http://example.com/service01.wsdl";> <from>$_c</from> <to>$_b/svc01:elemC</to> </copy> will incur selectionFailure: ERROR - GeronimoLog.error(104) | Assignment Fault: {http://docs.oasis-open.org/w sbpel/2.0/process/executable}selectionFailure,lineNo=98,faultExplanation={http:/ /docs.oasis-open.org/wsbpel/2.0/process/executable}selectionFailure: No results for expression: {OXPath10Expression $_b/svc01:elemC} But alternatively, using the XPath extention fuction insert-as-last-into() provided by ODE, the above initialization can be accomplished. The version of ODE I use is ODE 2.0 Build #87 (2009-1-8 2:25:04). The declaration of the variables is as: <variables xmlns:ws0="http://example.com/service01.wsdl";> ... ... <variable name="_a" element="ws0:elemA" /> <variable name="_b" element="ws0:elemB" /> <variable name="_c" element="ws0:elemC" /> <variable name="_a2" element="ws0:elemA2" /> </variables> And the schema is: <schema targetNamespace="http://example.com/service01.wsdl"; xmlns="http://www.w3.org/2001/XMLSchema"; elementFormDefault="qualified"> ... ... <element name="ResultInfo"> <complexType> <sequence> <element name="elemA"> <complexType> <sequence> <element name="elemB"> <complexType> <sequence> <element name="elemC" type="string" maxOccurs="unbounded"/> </sequence> </complexType> </element> </sequence> </complexType> </element> <element name="elemA2" type="string"/> </sequence> </complexType> </element> </schema> The complete file set is in the attachment. If this disagreement in ODE is not a bug but a intentional design, I guess the reason is that, according to WS-BPEL, even if it is supported, only the first child can be created and the creation of other children must appeal to some extension mechanism. See "8.4 Assignment"(P.62): "The fifth from-spec variant returns values as if it were a from-spec that selects the children of the <literal> element in the WS-BPEL source code. [SA00038] The return value MUST be a *single* EII or Text Information Item (TII) only." Am I right? Thanks & Regards Wenfeng ---------- ZHAO Wenfeng http://www.bupt.edu.cn -- Mark Ford MIT Lincoln Laboratory 244 Wood Street Lexington MA 02420 (781) 981-1843
