Importance

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Abstract

An SGML document accessing unit to automatically create a partial editing document type definition DTD, according to a partial editing request for an SGML type document, that represents a restriction against partial editing to keep the document conformance to the DTD of an entire document. An SGML document editing apparatus edits a portion of the document to be edited corresponding to the restriction of the partial editing DTD that represents a restriction against partial editing due to the existing document structure and influence of other editing works executing in parallel at the time when a partial editing request is issued. An extended content model is attached to every document element of a stored SGML document to reduce the cost of creating a partial editing DTD. The extended content model is a variant of a content model of an element declaration in a DTD, and it represents arrangement of child document elements of its relating document element with instance identifiers of the child document elements. Revision histories of the extended content models of all document elements are also recorded to make history information of the document structure.

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First Claim