Sequentially encoded data structures that support bidirectional

Details Sequentially encoded data structures that support bidirectional Sequentially encoded data structures that support bidirectional

1974-06-24

1976-02-10

Ruggiero, Joseph F.

Communications: electrical

Digital comparator systems

360 48, G06F 700

Patent

active

039381056

ABSTRACT:
A coding method and apparatus that supports bidirectional scanning is disclosed for sequences of fields of variable length and/or type. Symmetric difference separators of the two immediately adjacent data field types are generated by exclusive-OR addition and utilized as punctuation marks to support bidirectional scanning. Parity checking techniques and hardware are utilized to resolve boundary alignment problems when a separator is in error. An extension of the concept of the invention to hierarchical parenthesized structures permit skipping over subtrees without scanning their contents.

REFERENCES:
patent: 3366928 (1968-01-01), Rice et al.
patent: 3387293 (1968-06-01), Stockebrand
patent: 3439344 (1969-04-01), Stanga
patent: 3688286 (1972-08-01), Bennett et al.
patent: 3766529 (1973-10-01), McLaughlin

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