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You can use the mapping expression built-in the Web Mapper to map source schema elements to the target schema elements. These mapping functions are listed as:

• Math
• String
• Date
• Aggregation
• Conditional 
• Axis 
• Boolean
• Context
• DB

All these mapping expression comprise of sub-functions using which you can map elements. 
 
Steps to map elements using Mapping Expression

1. Ensure that the source and target schemas are loaded and all their elements are listed under their respective nodes.
2. Click Mapping Expression tab from Mapping Functional Panel.

3. Click a target destination element. The target destination element node is displayed in the Mapping Graph Expression Area (see Figure 439).
   

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   Figure 439: Select Target Element

   
   
   
   

4. Double-click Click a source element. The source element is displayed in the Mapping Graph Area (see Figure 440).

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   Figure 440: Select Source Element

   the Mapping Expression Area. 
   
   You can

   double-

   click more source elements if required. This will display the selected source elements in the Mapping

   Graph Area (see Figure 441).Image Removed
   Figure 441: Select Second Source Element

   Expression Area.

5. Click the desired mapping functionexpression. This displays a list of sub-functions associated with the selected mapping functionexpression.
6. Select the desired sub-function and use it to map the displayed source and target destination elements.
7. Once you have performed the mapping activity, click Apply Mapping (  ) button to save the mapping.

For details on using these mapping functions, refer to the section Using Mapping Functions. 
While mapping elements, certain suffixes are displayed next to source and target elements in the Source and Target Panels. These suffixes are explained in the table below.

 Table 8: Suffixes of Source and Target Elements