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A method is described for managing shared data among elements of a hierarchic document (e.g. a Standarized Generalized Markup Language (SGML) document) to thereby facilitate document formatting.
English (United States)
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A Technique for Sharing Data Among Elements of a Hierarchic Document
A method is described for managing shared data among elements of a
hierarchic document (e.g. a Standarized Generalized Markup Language (SGML)
document) to thereby facilitate document formatting.
Two kinds of shared data exist in these documents: a local shared variable
which can take on many different values in a document, but has a single value in
any given element of the document, and a global shared variable which can take
on only a single value in a document and whose value applies to the document
as a whole.
A hierarchic document can have a logical tree (L-tree) structure each node of
which corresponds to an element (i.e. a SGML tag) of the document. Whenever a
data-sharing procedure is called by a routine which performs formatting actions
on an element, a record is created and attached to that node. A given L-tree
node may have several records if it reads and writes several shared variables.
When a variable is written or read by a procedure being executed at a node,
the record thus created contains the name of the procedure by which it is
created. This procedure name is used to identify a node at which the value of a
variable is affected. It also identifies a node at which the current value of a
variable is depended upon and thus needs to be re-executed because of the new
value. Obviously, the record also contains the name and current value of the
shared variable upon which the procedure o...