You can import and export object repositories from and to XML files. You import and export the files using the File > Import from XML and File > Export to XML options in the Object Repository Manager.    

XML provides a structured, accessible format that enables you to make changes to object repositories using the XML editor of your choice and then import them back into UFT.

UFT uses a defined XML schema for object repositories (ObjectRepository.xsd), which is located in the <UFT installation folder>\dat folder.  This document describes each of the elements and complex types defined for the object repository schema.  You must follow this schema when creating or modifying object repository files in XML format.

Tip: After creating or editing an object repository XML file, it is recommended to use the UFT Schema Validation functionality to verify that your file conforms to the UFT object repository schema. (Choose Insert > Checkpoint > XML Checkpoint (From Resource) to create an XML checkpoint on your XML file and then click the Activate Schema Validation button.) 

For more information on UFT Schema Validation, refer to the Unified Functional Testing User Guide.