soa - Bpel arrays transformation foreach -

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i have bpel process receive array , output one.

the thing is, need first 1 elements, populate second 1 , add elements in second one.

my first 1 array kind of object: 

<xsd:complextype name="comment_a">   <xsd:sequence>     <xsd:element name="id" type="xsd:int"/>     <xsd:element name="username" type="xsd:string"/>     <xsd:element name="name" type="xsd:string"/>     <xsd:element name="picture" type="xsd:base64binary"/>     <xsd:element name="date" type="xsd:string"/>     <xsd:element name="hour" type="xsd:string"/>     <xsd:element name="bus-line" type="xsd:string"/>     <xsd:element name="bus-number" type="xsd:integer"/>     <xsd:element name="description" type="xsd:string"/>     <xsd:element name="rate" type="xsd:int"/>   </xsd:sequence> </xsd:complextype>

my second one: 

<xsd:complextype name="comment_b">   <xsd:sequence>     <xsd:element name="id" type="xsd:int"/>     <xsd:element name="username" type="xsd:string"/>     <xsd:element name="name" type="xsd:string"/>     <xsd:element name="picture" type="xsd:base64binary"/>     <xsd:element name="date" type="xsd:string"/>     <xsd:element name="hour" type="xsd:string"/>     <xsd:element name="bus-line" type="xsd:string"/>     <xsd:element name="bus-number" type="xsd:integer"/>     <xsd:element name="description" type="xsd:string"/>     <xsd:element name="rate" type="xsd:int"/>     <xsd:element name="type-comment" type="xsd:string"/>     <xsd:element name="liked-number" type="xsd:int"/>   </xsd:sequence> </xsd:complextype>

so first, tried iterate on first array populate second 1 properties both have in common. tried use foreach element.

my code seems this: 

<foreach parallel="yes" countername="c" name="foreachcomment">   <startcountervalue>1</startcountervalue>   <finalcountervalue>count($comments.vwcommentcollection/ns3:vwcomment)</finalcountervalue>   <scope name="scope1">     <assign name="assignresult">       <extensionassignoperation>         <bpelx:copylist>           <bpelx:from>$comments.vwcommentcollection[$c]</bpelx:from>           <bpelx:to>$outputvariable.payload</bpelx:to>         </bpelx:copylist>       </extensionassignoperation>       <copy>         <from>$comments.vwcommentcollection[$c]/ns3:vwcomment/ns3:id</from>         <to>$outputvariable.payload/ns2:comment/ns2:id</to>       </copy>     </assign>   </scope> </foreach>

i tried first id element test, when comment_a array has size greater 1, receive exception

$comment variable comment_a array

i found solution following brazilian blog: http://blog.iprocess.com.br/2012/09/oracle-soa-suite-11g-uso-da-atividade-assign-no-bpel/

i used append opperation inside bpel


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