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Logical Expression Restricted Notation

IP.com Disclosure Number: IPCOM000037653D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barker, BA: AUTHOR [+3]

Abstract

Restricted notation is a function that allows layout and logical structures of large documents to be verified in one pass over the content of the document.

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Logical Expression Restricted Notation

Restricted notation is a function that allows layout and logical structures of large documents to be verified in one pass over the content of the document.

Restricted notation is expressed in current architecture and documents created by products using the architecture by a parameter on layout and logical expression functions. The parameter specifies whether or not the expression is restricted. The parameter appears on a Layout Descriptor (LOD) structured field for layout expressions and on a Document Descriptor (DOD) structured field for logical expressions. The parameter value is X'00' if the expression is unrestricted and X'01' if the expression is restricted. The use of the AND connector in the table index type parameter of Layout Index (LOI) and Document Index (DOI) structured fields is prohibited if the expressions are restricted. The AND connector specifies that all layout or logical constructs within the portion of the expression under control of the AND connector must occur, but the order of occurrence is arbitrary. The arbitrary order of occurrence forces applications to scan document content more than once when the order of the content is not the same as the order of the constructs in the expression.

When the expressions are restricted the content of a large document can be scanned and verified in one pass. A large number of passes could be required to scan and verify the content of a document when the expressions...