Data templates and transformations > Data transformation process reference > Meta rules (recurse and enumerate) > Example of recurse
Example of recurse
Note:
This example illustrates the transformation process used in general XML to XML transformation (transformation is not limited to StoryTeller).
In this example the data source contains a <message> element containing a structure of elements representing employee data. The expected output should only contain the employee data, and this employee data should be copied from the source data without any changes.
Data source
<data>
   <message>
      <employee>
        <name>John Smelter</name>
         <department>Forestry Department</department>
         <university>Education University</university>
            <address>
            <street>Witham Hall</street>
            <number>100</number>
            <city>London</city>
            <zipcode>1GH 423</zipcode>
         </address>
      </employee>
      <employee>
         <name>John Smith</name>
         <department>Foreign Department</department>
         <university>Foreign University</university>
         <address>
            <street>Williams Hall</street>
            <number>111</number>
            <city>Washington DC</city>
            <zipcode>20001-111</zipcode>
         </address>
      </employee>
   </message>
</data>
Expected result
<data>
   <employee>
      <name>John Smelter</name>
      <department>Forestry Department</department>
      <university>Education University</university>
      <address>
         <street>Witham Hall</street>
         <number>100</number>
         <city>London</city>
         <zipcode>1GH 423</zipcode>
      </address>
   </employee>
   <employee>
      <name>John Smith</name>
      <department>Foreign Department</department>
      <university>Foreign University</university>
      <address>
         <street>Williams Hall</street>
         <number>111</number>
         <city>Washington DC</city>
         <zipcode>20001-111</zipcode>
      </address>
   </employee>
</data>
Data template
<data>
   <employee>
      <name>?</name>
      <department>?</department>
      <university>?</university>
      <address>
         <street>?</street>
         <number>?</number>
         <city>?</city>
         <zipcode>?</zipcode>
      </address>
   </employee>
</data>
Data transformation
<tdt:transformation>
   <tdt:rule path="/data/employee">
      <tdt:value key=".">/data/message/employee</tdt:value>
      <tdt:value key="recurse">.</tdt:value>
   </tdt:rule>
</tdt:transformation>
Compiled transformation (data instance)
<tdt:transformation>
   <tdt:rule path="/data/employee">
      <tdt:value key=".">/data/message/employee</tdt:value>
   </tdt:rule>
   <tdt:rule path="/data/employee/address">
      <tdt:value key=".">address</tdt:value>
   </tdt:rule>
   <tdt:rule path="/data/employee/address/city">
      <tdt:value key=".">city</tdt:value>
      <tdt:value key="text()">text()</tdt:value>
   </tdt:rule>
   <tdt:rule path="/data/employee/address/number">
      <tdt:value key=".">number</tdt:value>
      <tdt:value key="text()">text()</tdt:value>
   </tdt:rule>
   ...
   <tdt:rule path="/data/employee/department">
      <tdt:value key=".">department</tdt:value>
      <tdt:value key="text()">text()</tdt:value>
   </tdt:rule>
   <tdt:rule path="/data/employee/name">
      <tdt:value key=".">name</tdt:value>
      <tdt:value key="text()">text()</tdt:value>
   </tdt:rule>
   <tdt:rule path="/data/employee/university">
      <tdt:value key=".">university</tdt:value>
      <tdt:value key="text()">text()</tdt:value>
   </tdt:rule>
</tdt:transformation>
OpenText StreamServe 5.6.2 Updated: 2018-01-26