AGGREGAT XML OUTPUT

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AGGREGAT XML OUTPUT

Hi,

I generate an output XML file, and a sery of bloc looks like bellow

<StopArea>
  <objectId>BUSVERT:StopArea:76660</objectId>
  <objectVersion>1</objectVersion>
  <creationTime>2018-04-25T13:48:17</creationTime>
  <name>SANDOUVILLE </name>
  <contains>BUSVERT:StopPoint:12</contains>
  <centroidOfArea>BUSVERT:AreaCentroid:76660</centroidOfArea>
  <StopAreaExtension>
    <areaType>CommercialStopPoint</areaType>
    <fareCode>13</fareCode>
    <registration>
      <registrationNumber>76660</registrationNumber>
    </registration>
  </StopAreaExtension>
</StopArea>

<StopArea>
  <objectId>BUSVERT:StopArea:76660</objectId>
  <objectVersion>1</objectVersion>
  <creationTime>2018-04-25T13:48:17</creationTime>
  <name>SANDOUVILLE </name>
  <contains>BUSVERT:StopPoint:22</contains>
  <centroidOfArea>BUSVERT:AreaCentroid:76660</centroidOfArea>
  <StopAreaExtension>
    <areaType>CommercialStopPoint</areaType>
    <fareCode>13</fareCode>
    <registration>
      <registrationNumber>76660</registrationNumber>
    </registration>
  </StopAreaExtension>
</StopArea>

You can note that all data have the same only data of contains tag

So my focus is top aggrege output to have this exemple 

<StopArea>
  <objectId>BUSVERT:StopArea:76660</objectId>
  <objectVersion>1</objectVersion>
  <creationTime>2018-04-25T13:48:17</creationTime>
  <name>SANDOUVILLE </name>
  <contains>BUSVERT:StopPoint:12</contains>
  <contains>BUSVERT:StopPoint:22</contains>
  <centroidOfArea>BUSVERT:AreaCentroid:76660</centroidOfArea>
  <StopAreaExtension>
    <areaType>CommercialStopPoint</areaType>
    <fareCode>13</fareCode>
    <registration>
      <registrationNumber>76660</registrationNumber>
    </registration>
  </StopAreaExtension>
</StopArea>

Thank you for help,