The XML node location of the value that will be stored in the SharePoint list when the item is selected and the list item is saved. This property is optional; if no value is provided, the lookup will utilize the value represented by the URL to XML. This property 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: Value of the URL to XML property
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>