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XHTML_Input_Filter meaning in log on 5.6.2 CF4

Hello, we upgraded Streamserve SDK to 5.6.2 CF4 that put a fix on log level 2.
We have always used level 2 which showed us errors, warnings and calls to individual print jobs.
Now with the CF4, level 2 really only shows warning and errors and if there are none it shows nothing.
With level 3 we can see process calls again but it also shows other information that I didn't see before, such as a huge list of:
XHTML_Input_Filter: starts the analysis
XHTML_Input_Filter: Finished successfully
So I was wondering what that command means and what it was for. In the official documentation I didn't find anything (but maybe I didn't find it useful to look well).
Thanks
regards