Dolmen_intf.TagInterfaces for Tags. Tags are used to attach arbitrary information to ndoes in an ast.
module type S = sig ... endBase signature for tags.
module type Ae_Base = sig ... endMinium required signature for tags to typecheck Alt-Ergo's core/base theory.
module type Smtlib_Base = sig ... endMinium required signature for tags to typecheck smtlib's core/base theory.
module type Zf_Base = sig ... endTags