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Having seen so many forums dealing with the mapping concepts & Techniques, Mapping errors and how to use various mapping in XI, I thought of preparing a consolidated list of all the mapping blogs which will be helpful to all the developer. I would like to thank all the contributors for providing these many blogs on the mapping concepts. 
     These links provided below will deal with various techniques that are handled in mappings.

Simple java code in graphical mapping - XI https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/1321

GlobalContainer - in graphical mapping (XI) https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/1352

XI: How to test your mapping (in real life scenarios) https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2374

XI: XML node into a string with graphical mapping? https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2620

Sending Java code as payload to do mapping in XI https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2835

Skelton of Mapping Runtime in SAP XI Did we bother to understand why the RFC Destination AI_RUNTIME_JCOSERVER is very important https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5404

Accessing System Parameters in Mapping Runtime https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5336

Message Mapping Simplified - Part II NODE FUNCTIONS https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2171 https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2792

Limitations of Message Mapping Editor in XI-Can we make it user-friendlier? https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2775

The Use of "suppress" in the XI 3.0 Graphical Mapping Tool https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2989

New functions in the Graphical Mapping Tool SP13 https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2458

SAP PI 7.1 Mapping Enhancements Series: Correct Structural Inconsistencies https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8662

SAP PI 7.1 Mapping Enhancements Series: Graphical Support for JDBC and RFC Lookups https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8661

SAP PI 7.1 Mapping Enhancements Series: Parameterized Message Mappings https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8654

SAP NetWeaver Process Integration 7.1: Mapping Enhancements Blog Series https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8650

SAP PI 7.1 Mapping Enhancements Series: Mapping Enhancements Demo https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8282

SAP PI 7.1 Mapping Enhancements Series: Copy XML Subtree https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8649

SAP PI 7.1 Mapping Enhancements Series: Using Graphical Variable https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8638

SAP PI 7.1 Mapping Enhancements Series: Share User-Defined Functions https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/7331

SAP PI 7.1 Mapping Enhancements Series: Import SQL Table's Metadata https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/7346

Using Folders in PI 7.1 https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/7010

TechEd 2006: EPI351 - Graphical Mapping Tool-Advanced Message Mapping https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4294

Minimize memory usage during Message Mapping when replicating an element https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3362

New Arithmetic and Statistical Functions in Message Mappings in SP18 https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4277

Never, ever use XI's built-in arithmetic functions https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3446

Sequence Number Generation: Mapping Pattern in PI https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8345

Summarization: Mapping Pattern in PI https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/8336

Message Mapping - using of E1BPPAREX => experience in the aspect of maintenance and customer usability https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/7915

Duplicating Sub trees and Numbering Them Using the Graphical Mapping Tool https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4052

Message Splitting Using the Graphical Mapping Tool https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3765

Replication of Nodes Using the Graphical Mapping Tool https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3468

Standard functions in message mapping http://help.sap.com/saphelp_nw04/helpdata/en/43/c4cdfc334824478090739c04c4a249/frameset.htm

New Arithmetic and Statistical Functions in Message Mappings in SP18 https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4277

Hack: Using XPATH in XI Message Mappings https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5418

Message mapping verification https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4445

Mapping Context Changes in XI https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5210

Mapping trouble shooting https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/e01e9400-9e81-2910-20a5-a862945a5e98

Mapping Context Changes in XI https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5210

 
File Content Conversion for Multi Hierarchical Structure

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/7154

 
Number formatting to handle LARGE Numbers

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2554

 
Optimizing Lookup's in XI

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2781

 
Data Mining using APriori Algorithm in XI - Part I, II & III

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2852

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2934

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/2715

 
Java Mapping to handle flat files in SAP XI

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5242

 
xpath functions in xslt mapping

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3416

 
"JAVA MAPPING", an alternate way of reading a CSV file

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4018

 
B2B Mapping Techniques Using the Graphical Mapping Tool

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3666

 How to parse "XX/YY/ZZ;AA/BB/CC;11/22/33" in message mapping https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4963

 
Introduction to queues in message mapping

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/1832

 
ValueMapping using the Graphical Mapping Tool

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/5479

 
Accessing Value Mapping defined in Directory using Java functions

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4702

 
Multi-Mapping without BPM - Yes, it's possible!

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/3115

 
Designing Mapping:

http://help.sap.com/saphelp_nw04/helpdata/en/d2/58cd3b11571962e10000000a11402f/content.htm

 
User-Defined Functions

http://help.sap.com/saphelp_nw04/helpdata/en/22/e127f28b572243b4324879c6bf05a0/content.htm

 
Standard Functions

http://help.sap.com/saphelp_nw04/helpdata/en/43/c4cdfc334824478090739c04c4a249/content.htm

 
Runtime Procedure

http://help.sap.com/saphelp_nw04/helpdata/en/3d/24e15bf9d79243b45d49b13b03de8f/content.htm

 
Mapping Fields Within a Context

http://help.sap.com/saphelp_nw04/helpdata/en/e4/82cf0ec8b9494db92e27e2be69524f/content.htm

 
Structure Mapping by Setting the Context

http://help.sap.com/saphelp_nw04/helpdata/en/bd/ca1105c81c6742a0f8c8d49f8834bf/content.htm\\

Comparing Performance of Mapping Programs

https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4259