Service 'IN' parameters are validated. Default is allow-html='none'
This filters out all the html chars. e.g one cannot set this text "Tom's age is likely > Paul's age"
'>' is not allowed
Rederers already escape html, so it may be best to keep validation alllow-html='any'. If service has a need to constrain, service should specify allow-html explicitly.
Attaching patch. Please let me if this does not make sense.