Forum OpenACS Development: Re: Looking for guidance is using template_tag to modify "input" tag
'checked' gets changed to 'checked="checked"'
to avoid this, handle Boolean attributes separately (as this is necessary also on other places, such as e.g. in the xowiki/tcl/form-field-procs).
... pass messages to/from the containing formIt is possible to overload also "outer" tags, build a stack of such tags with client specific code and query this from the inner tag handlers.