Page Builder API 
The Page Builder API provides methods for controlling the page size, refreshing the page and page personalization.
Most of the methods of this API receive the iView ID parameter, which is the URI of the iView in the Portal Content Directory (PCD).
Example
Fully specified URI of an iView:
pcd:portal_content/every_user/general/eu_role/com.sap.portal.mypages/com.sap.portal.eu_ws/com.sap.portal.home/com.sap.portal.pageBuilderDefault
End of the example.
Note
To use the Page Builder API, you need to relax the portal component's domain. For Java portal components, this is done automatically by the EPCM object.
For more information, see Relaxing of the Same Origin Policy
End of the note.