The SGML property set

Defines the classes and properties to be used in the construction of
groves from the parsing of SGML documents.

Classes and properties are classified as follows:
  o Abstract or SGML document string (SDS)
  o SGML declaration, document prolog, or document instance
  o Required only for support of datatag, rank, shortref, link, subdoc,
    fpi, architectures, notset, fsi, genarc, pelement.

ESIS corresponds roughly to the combination of baseabs (base abstract),
prlgabs0, and instabs (instance abstract).

Normalisation rules:

	Description
general	Declared concrete syntax general namecase substitution.
entity	Declared concrete syntax entity namecase substitution.
rcsgener	Reference concrete syntax general namecase substitution.

Modules in default grove plan

Module base abstract (baseabs)
Module prolog abstract level 0 (prlgabs0)
Module instance abstract (instabs)

Other modules

Module base SGML document string level 0 (basesds0)
Module base SGML document string level 1 (basesds1)
Module sgml declaration abstract (sdclabs)
Module SGML declaration SGML document string (sdclsds)
Module prolog abstract level 1 (prlgabs1)
Module prolog SGML document string (prlgsds)
Module instance SGML document string level 0 (instsds0)
Module instance SGML document string level 1 (instsds1)
Module datatag abstract (dtgabs)
Module rank abstract (rankabs)
Module shortref abstract (srabs)
Module shortref SGML document string (srsds)
Module link abstract (linkabs)
Module link SGML document string (linksds)
Module subdoc abstract (subdcabs)
Module subdoc SGML document string (subdcsds)
Module formal public identifier abstract (fpiabs)
Module SGML architecture abstract (arcabs)
Module formal system identifier abstract (fsiabs)
Module data attributes for elements abstract (dafeabs)
Module general architecture common data attributes abstract (gadcnabs)
Module pseudo-element abstract (pelement)