Page Comparison

 This data source can be used to fetch data from the current form into a control.

Query

Source XPath
 XPath 
XPath to fetch data from the form.

Results

 Options to map and format result data.

Item XPath
XPath of the item that will be listed in the related control. If it is left empty, which is the same as the * value, all resulting items are listed.

List Item Formatting

 Customizes the format of the control's display options.

Display Text Format
Specify the format to display the result text. You can use column names inside curly braces. Ex: {{Name}} - {{Id}}

Value Format
Specify the format of the value. You can use column names inside curly braces. Ex:  {{Id}} - {{Type}}

Selection Mappings 

In order to map the selected data from the current form into an XPath, create a mapping by pressing Add New button.

Source  

Source
 

Target
 

Hierarchy ColumnNode name to map its data.

Target
XPath to map data into.

Hierarchy XPath