Rich Hall Reps
As far as I can tell Canon XA-25 is not a mini DV or HDV camcorder with an iLink for DV or HDV data capture firewire into a Premiere Elements capture window. In that regard, Adobe has removed that feature from its latest version 13/13.1. Premiere Elements 12/12.1 is the last version to have this feature which has a classical history of working only with a firewire connection. In Premiere Elements 13/13.1, Add Media will not include DV Camcorder or HDV Camcorder. The surviver is Webcam or WDM with description "Capture video from webcam or other WDM compatible device".
But, my interpretation of what you are seeking is not DV or HDV capture firewire, but rather live streaming of uncompressed video from the Canon XA-25 using the Canon SDI Output
Canon XA25: Our New Favorite Camera - Association Studios
The following Adobe document was pointed to 3 months ago by a staff member responding to a user question on Live Video Streaming using Premiere Elements.
Premiere Elements: How do capture live / streaming video?
The link pointed to does not appear to be updated for 13/13.1 which was released September 24, 2014.
Adobe Premiere Elements Help | Capture video from camcorders and webcams
Based on the above, I am not sure if the Canon output can be made to work with the Add Media/Webcam or WDM choice with the Canon being recognized in the Capturing Source field of the Webcam or WDM Capture Window. Do you have any version of Premiere Elements to explore this possibility?
ATR