Page created by Arjan Loeffen, last revision dd. In the following overview I do not go into the object-oriented model on which the document design is based. The 'system' is assumed to be built out of objects only, following a SmallTalk or Actor approach.
Classes are objects that store shared information in 'class attributes'.
The objects described here model the following characteristics of the structural model of SGML , as extracted from the standard. Translators Objects are created by evaluating expressions . SGML is a language for describing the structure of a document as it is exchanged. An abstract model of text is implied. Translation of SGML expressions into TBMS expressions is performed by an SGML object.