In WSAD (and in an increasing number of the IBM eclipse-based tools),
Validate is an important concept. Basically, for a good number of editors
that are backed by a well formed models (eg., HTML, SQL, XML, etc.), the
Validate action allows users to check the correctness of what they have
entered in the editor, without committing (saving) those changes to some
As you say, the closest concept in the platform at the moment is build.
But this action has strong ties back to the complier heritage of IDEs and
isn't, perhaps, the most generic or extensible action to pattern our work
on as we go forward.
As the thinking around the workbench further matures, perhaps the notion
of "validation" as distinct from "save" can be considered.