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You can use the mapping expression built-in the Web Mapper to map source schema elements to the target schema destination layout 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 Select a destination element . The destination element node is displayed in the Mapping Expression Area.
   Click a source element. The source element is displayed in the Mapping Expression Area. 
   You can click more source elements if required. This will display the selected source elements in the Mapping Expression Area.which you want to map.

4. Click the desired mapping expression. This displays a list of sub-functions associated with the selected mapping expression.

5. Select the desired sub-function and use it to map the

   displayed

   source and destination elements. 

6. Once you have performed the mapping activity, click Save button to save the mapping.

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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 destination elements in the Source and Target destination Panels. These suffixes are These suffixes are explained in the table below.