You may use Internal System Variables in your XML Export Templates. These Variables may be used throughout the XML file to ease up Metadata processing.

Capture Section Keys	Description
%Just_In_Container	Will be replaced by one of the following values: MXF GC MXF D-10 MXF XDCAM Avid OP-Atom AVFoundation QuickTime AVFoundation MP4
%Just_In_Timecode_Source	Will be replaced by one of the following values: Computer Time VTR - RS-422 LTC over Audio Capture card LTC SDI Embedded
%Just_In_Framerate	Will be replaced by the Framerate (23.97, 24, 25…).
%Just_In_Aspect_Ratio	Will be replaced by the Aspect Ratio.
%Just_In_Capture_Codec	Will be replaced by the full name of the Codec.
%Just_In_Audio_Channels	Will be replaced with the actual number of Audio Channels.
%Just_In_Capture_Resolution	Will be replaced by the resolution of the target format.
%Just_In_Capture_Width	Will be replaced by the capture width.
%Just_In_Capture_Height	Will be replaced by the capture height.
General Keys
%Just_In_Capture_Split	Will be replaced by one of the following values: 0: no Split occurred 1: Split occurred 2: last Clip of the Split sequence
%Just_In_Previous_Split_Reference_Clip	Will be replaced by the filename of the Clip previous to the one currently Recording. Is empty if no Split occurred.
%Just_In_Capture_Duration	Will be replaced by the length of the Recording in standard time. Example: 00:30:00 = 30 minutes.
%Just_In_Capture_Inpoint	Will be replaced by the Inpoint timecode. This is the timecode of the first frame. Example:. 10:00:00:00.
%Just_In_Capture_Outpoint	Will be replaced by the Outpoint timecode. This is the timecode of the last frame. Example: 11:00:00:00.
%Just_In_Clipname	Will be replaced by the Clipname with extension. Example: sample.mov.
%Just_In_Full_Clipname	Will be replaced by the full Clipname. Example: /path/to/the/movie.mov.
%Just_In_Custom_Date	Will be replaced by a representation of the keys' value. Example: "%d/%m/%Y %H:%M:%S” will be replaced by 27/10/2017 15:32:53.

Every Variable of the Naming Convention is available for Metadata processing, just use the Variable of Naming Convention as the key. There's one special case though: %Name (or any custom variable) will be replaced by the contents of the Name field (or any custom fields) of the Clip section. In Schedule Mode this field will be as specified in the Apple Calendar Event.