The tags for all of the HTML_BASIC components in Facelets have a "converter" attribute that is specified to do the following.
(must evaluate to javax.faces.convert.Converter)
Converter instance registered with this component.
In practice, looking at com.sun.faces.facelets.tag.jsf.ValueHolderRule, this also supports a value that is a converter id.
The spec should be updated to reflect this reality.