The XML node location of the value that will link the choice back to its parent details. This link is utilized on the item display form from within SharePoint. This property is optional. It can be specified in one of two ways:
1) A simple xpath query, represented by the following:
:xpath=(your xpath query here)
2) An XML string, which allows you to specify a more complex value consisting of multiple xpath queries and static text values. The XML string will contain a values root node with child value nodes representing your individual string pieces. The value nodes contain a single attribute type which tells the property whether it should treat the value as static text or an xpath query. The attribute values are type="text" or type="xpath".
Default: empty
Example:
:xpath=NewDataSet/Table1/Title
<values>
<value
type="xpath">NewDataSet/Table1/Title</value>
<value type="text"> -
</value>
<value
type="xpath">NewDataSet/Table1/Description</value>
</values>