What is Context Change

Hi
experts plz tell me what is context change

Hi
Context : Context of an element is nothing but just the level, where
the XML tag appears in the given XML
document. Level of any element is set to the immediate parent node by
default.
Context Change : Context change is just changing the level of XML
tag(element level in XSD) in the XML document.
This means when we map one source field to one target field then that
both field segments should be at same
level.
Example
The reason that context changes can occur in mapping is because sometimes you want to manipulate the structure of the message that's being transferred between systems. For example, lets say you have a message being sent from one system as an XML file, and the structure looks similar to the following:
code
<header>
<field1></field1>
<field2></field2>
</header>
[/code]
However, the system that the message is being sent to has a requirement that each field be split into individual <header> format (I know, this is not a real world example), then you want to use context changes to make the format look something like this instead:
code
<header>
<field1></field1>
</header>
<header>
<field2><field2>
</header>
[/code]
Essentially, you use context mapping when your requirements ask you to change the structure of the XML message, not just strictly apply transformations to each field. You can also check this blog that incorporates user-defined functions for advanced context changes: Mapping Context Changes in XI
Message Mapping Simplified - Part I
/people/sravya.talanki2/blog/2005/12/08/message-mapping-simplified-150-part-ii
Hope this info is useful to you..
Thanks
Saiyog
Edited by: Saiyog Gonsalves on Aug 1, 2008 10:00 AM

Similar Messages

Context change

Hi,
what is context change?? where it is implemented?
thanks in advance.

Hi!
Context changes take place in Message Mapping when the source structure is processed. for more details about mapping and context change see sap online help - e.g. here http://help.sap.com/saphelp_nwpi71/helpdata/en/49/1ebc6111ea2f45a9946c702b685299/content.htm
Regards,
Volker
Additionally:
More detailed information about contexts and context changes see here: http://help.sap.com/saphelp_nwpi71/helpdata/en/3d/24e15bf9d79243b45d49b13b03de8f/content.htm
Edited by: Volker Kolberg on May 25, 2009 10:10 AM

Context Changes got impact on what?

Context Changes got impact on what?.

Hi Ash,
Context changes have impact on:
&#56256;&#56452; User-Defined Functions
&#56256;&#56452; Breaking and inserting of hierarchy levels
For more see below PPT of SAP:
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/be05e290-0201-0010-e997-b6e55f9548dd">https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/be05e290-0201-0010-e997-b6e55f9548dd</a>
Regards,
Subhasha Ranjan

Context change not working during test

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Context change by DOM parsing Java Mapping in XI

Hi Team,
I would like to know that how can I handle Context Change by DOM Parser Java Mapping in XI.?
Suppose the source XML structure I have like below:
<?xml version="1.0" encoding="UTF-8"?>
<ns0:Header xmlns:ns0="urn:bp:xi:hr:edm:test:100">
   <FileName>
      <filesub>
         <subname>a</subname>
         <subname>b</subname>
         <subname>c</subname>
      </filesub>
   </FileName>
   <FileName>
      <filesub>
         <subname>d</subname>
         <subname>e</subname>
         <subname>f</subname>
      </filesub>
   </FileName>
</ns0:Header>
Where the field FileName can occur maximum thrice(0...3) but the subname field is (0....unbounded) but in the target source I would like to have as given below:
<?xml version="1.0" encoding="UTF-8" ?>
- <MT_Test4 xmlns="urn:bp:xi:hr:edm:test:100">
- <Header>
<FileName>a</FileName>
<FileName1>d</FileName1>
    </Header>
- <Header>
<FileName>b</FileName>
<FileName1>e</FileName1>
   </Header>
Header>
<FileName>c</FileName>
<FileName1>f</FileName1>
   </Header>
</MT_Test4>
That means the first value from every context of the source field is forming my first and second value in my target first context.Thensecond value from every context is forming my 1st and 2nd value of my target 2nd context and finally 3rd value of every context is forming my 1st and 2nd value of my target 3rd context.Is this possible to done through DOM parsing or we have to do it by UDF only?

Hi Atanu,
    In my last post I gave an alogorithm to solve the mapping problem. Here is the complete program for the mapping.
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.sap.aii.mapping.api.StreamTransformation;
import com.sap.aii.mapping.api.StreamTransformationException;
public class DOMParser1 implements StreamTransformation{
     public void execute(InputStream in, OutputStream out)
               throws StreamTransformationException {
          try
               DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
               DocumentBuilder builderel=factory.newDocumentBuilder();
               /input document in form of XML/
               Document docIn=builderel.parse(in);
               /document after parsing/
               Document docOut=builderel.newDocument();
               TransformerFactory tf=TransformerFactory.newInstance();
               Transformer transform=tf.newTransformer();
               Element root,child,child1=null;
               Node textChild;
               NodeList l;
               int i,n1,j,div,k;
               String s[];
               root=docOut.createElement("MT_Test4");
               root.setAttribute("xmlns","urn:bp:xi:hr:edm:test:100");
               l=docIn.getElementsByTagName("subname");
               n1=l.getLength();
               s=new String[n1];
               for(i=0;i<n1;++i)
                         s<i>=l.item(i).getFirstChild().getNodeValue();
               l=docIn.getElementsByTagName("filesub");
               div=l.getLength();
               j=n1/div;
               for(i=0,k=0;i<j;++i)
                    child1=docOut.createElement("Header");
                    root.appendChild(child1);
                    child=docOut.createElement("FileName");
                    textChild=docOut.createTextNode(s[k]);
                    child.appendChild(textChild);
                    child1.appendChild(child);
                    child=docOut.createElement("FileName1");
                    textChild=docOut.createTextNode(s [ k + j ]);
                    child.appendChild(textChild);
                    child1.appendChild(child);
                    ++k;
               docOut.appendChild(root);
               transform.transform(new DOMSource(docOut), new StreamResult(out));
          catch(Exception e)
               e.printStackTrace();
     public void setParameter(Map arg0) {
     public static void main(String[] args) {
          try{
               DOMParser1 genFormat=new DOMParser1();
               FileInputStream in=new FileInputStream("C:/Apps/my dw/sdnq/apps.xml");
               FileOutputStream out=new FileOutputStream("C:/Apps/my dw/sdnq/tgt1.xml");
               genFormat.execute(in,out);
          catch(Exception e)
               e.printStackTrace();
source -> apps.xml
<?xml version="1.0" encoding="UTF-8" ?>
- <ns0:Header xmlns:ns0="urn:bp:xi:hr:edm:test:100">
- <FileName>
- <filesub>
<subname>a</subname>
<subname>b</subname>
<subname>c</subname>
</filesub>
</FileName>
- <FileName>
- <filesub>
<subname>d</subname>
<subname>e</subname>
<subname>f</subname>
</filesub>
</FileName>
</ns0:Header>
target structure -> tgt1.xml
<?xml version="1.0" encoding="UTF-8" ?>
- <MT_Test4 xmlns="urn:bp:xi:hr:edm:test:100">
- <Header>
<FileName>a</FileName>
<FileName1>d</FileName1>
</Header>
- <Header>
<FileName>b</FileName>
<FileName1>e</FileName1>
</Header>
- <Header>
<FileName>c</FileName>
<FileName1>f</FileName1>
</Header>
</MT_Test4>
Hope this helps
one more thing in this line "textChild=docOut.createTextNode(s k + j );"   somehow the the third braces one opening before k and one closing after j is missing for unknown reasons. Please correct it when you actually run this code.
regards
Anupam
Edited by: anupamsap on Mar 7, 2011 12:47 PM

Context change explicitly

How to apply context change explicitly?

Hi,
Refer the section context handling page No 19: Explicit Context selection.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f59730fa-0901-0010-df97-c12f071f7d3b
/people/riyaz.sayyad/blog/2006/04/23/introduction-to-context-handling-in-message-mapping
Also u can achieve it by writing the code in UDF.Already provided by experts
Thnx
Chirag

Context changes

wat is context and how it changes?

Hi,
Assume u have message type as follows.
i.e MTO_Sample-
       -Data1
          - filed1
          - filed2
          - filed3
      -Data2
          - filed1
          - filed2
          -filed3
    -Data N
          - filed1
          - filed2
         - filed3
where Data1, Data2 and Date3 are context..
assume u have Data1 with 2 records, then start of second record nothing but context change.
please chk the following link.
http://help.sap.com/saphelp_nw04s/helpdata/en/48/444941db42f423e10000000a155106/frameset.htm
/people/yukai.shi/blog/2006/06/02/b2b-mapping-techniques-using-the-graphical-mapping-tool
/people/harrison.holland5/blog/2006/12/08/mapping-context-changes-in-xi
regards
mahesh.

User changes in tab strip ui element are not recorded in context change log

Hi All,
We are using a tab strip ui element in webdynpro component. But user changes inside tab strip ui element are not getting recorded to the context change log. I have an input field on the same view besides tab strip ui element. User changes to this input field are getting recorded to the context change log.
Is there any restriction on context change log usage with tab strip ui element?
Could you please suggest If there is any way to record changes inside tab strip ui element.
Thanks,
Sudheer.

I think there are some limitations exists, context change logs are not complete when you do value help , i am not sure about tab strip.
[http://help.sap.com/saphelp_nw70ehp1/helpdata/en/47/a8e5d273b12fe2e10000000a42189d/content.htm|http://help.sap.com/saphelp_nw70ehp1/helpdata/en/47/a8e5d273b12fe2e10000000a42189d/content.htm]

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Add a context change after a set of values in a context

Dear experts,
My requirement is as follows:
Scenario: Idoc to Idoc. I need to check if there are line items > 5- I need to do a split. The split is happening properly via my mapping but I have a problem at the header record level on the target- I do not get the values populated correctly. I need to add a context change after 5 values in the queue.
eg:
Say there are 2 Idocs at the source with following unique IDs: called Journal ID:
My source:
Idoc 1: Journal ID 123
Line Itme 1
Line Item 2
Idoc 2: Journal ID 124
Line item 1
Line item 2
Line item 3
Line item 4
Line item 5
Line item 6
Line item 7
So I need to get total of three Idocs in my target:
Idoc 1: Journal Entry 123
Line Item 1
Line Item 2
Idoc2: Journal Entry 124
Line item 1
Line item 2
Line item 3
Line item 4
Line item 5
Idoc3: Journal entry 124
Line item 6(new 1)
Line item 7(new 2)
The split in the target Idoc is working perfectly. But inside the header record the journal ID field(taken from Item record level) is not populating correctly. I am getting this output:
Idoc 1: Journal Entry 123
Header Record-->JournalID Field value= '123'
Line Item 1
Line Item 2
Idoc2: Journal Entry 124
Header Record-->JournalID Field value= '124'
Line item 1
Line item 2
Line item 3
Line item 4
Line item 5
Idoc3: Journal entry 124
Header Record-->JournalID Field value= Null
Line item 6(new 1)
Line item 7(new 2)
So please suggest a UDF/standard function to populate the right values inside header record--->Journal ID field.Something like the below...
public void calculate(String[] var1, ResultList result, Container container) throws StreamTransformationException{
for ( int i = 0; i < var1.length; i++ )
if( var1[i].length() > 5) //here var1 I am passing the Journal ID
result.addContextChange();
Apparently this doesnt work.

The first Idoc has two line items and the second idoc has 7 line items. As the split is per 5 line item- the target has 3 Idocs.
Now the problem is that the header value in the target: REF_DOC_NO has to be created as per the number of line items and doesnt come from header record directly.

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