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Mapping is either of the types 'custom'/'xpath'. All the fields or defined values to include or exclude to  derive actual field values of xml.
Custom is the type where its  definitions are customized and understood by only that type of doc  builder.
 XPathXPath is the one defined to be of derived xpath of the elements in conjunctions with its types of concerned java, what tags or fields  to be
included or excluded.

       <field id="ContractNumber_search" name="Contract Number" type="text">

          <mapping type="xpath">

              <include>/publicationsLicenseExpression/licenseDetail/licenseIdentifier/IDValue/value</include>                       

          </mapping>

       </field>

Above is the example for the field of mapping type xpath.