Forum OpenACS Development: parameter for prefered tag style for markup generators?

Is blank-master's doc(type) the default indicator that markup generators should use to generate markup for an OpenACS page?
If so, in order to avoid the complexity of accessing the value of doc(type) (if it exists) from a "slave" template, can the currently hard-coded value in blank-master be moved to a parameter?

If so, where should the parameter go, acs-templating? acs-subsite?