These maps are called transformation maps and use the eXtensible Stylesheet Language(XSL) to describe data mappings which allows us to perform complex data manipulation. A standard set of XPath functions are provided for you to define how data is modified when moving from one application to another.
The mapper supports both qualified and unqualified schemas (that is, schemas without elementFormDefault=”qualified”). Elements and attributes with and without namespace prefixes are also supported.
Elements and attributes for which mapping is required are identified by a blue asterisk (*) to the right of their names. To display only required fields, click the Filter , select Required either from Source or Target, and click Apply.