11. A digital data processing apparatus for electronic spelling verification comprising A. input means for accepting a signal representative of a suspect linguistic expression, B. database storage means for storing a linguistic expression database, said database storage means including master lexicon storage means for storing digitally encoded information representative of plural linguistic expressions and including plural addressable lexicon storage blocks, each said block storing one or more lexicon entries, each said lexicon entry storing signals representative of a linguistic expression, each said expression including at least one alphanumeric character, C. database access means connected with said input means and with said database storage means for accessing information stored in said linguistic expression database, said database access means including master lexicon access means for addressably accessing each said lexicon storage block according to its skeletal collation range, said skeletal collation range being defined by upper and lower bounds of a collation sequence of linguistically salient word skeletons of said one or more linguistic expressions represented within a lexicon storage block, and D. database verification means connected with said database access means for locating within said linguistic expression database a linguistic expression matching suspect expression, said database verification means including master lexicon verification means for matching said suspect expression with a linguistic expression represented within said master lexicon means, and E. output means connected with said database verification means for generating a signal indicative of the success of locating a matching database expression.
11. A digital data processing apparatus for electronic spelling verification comprising A. input means for accepting a signal representative of a suspect linguistic expression, B. database storage means for storing a linguistic expression database, said database storage means including master lexicon storage means for storing digitally encoded information representative of plural linguistic expressions and including plural addressable lexicon storage blocks, each said block storing one or more lexicon entries, each said lexicon entry storing signals representative of a linguistic expression, each said expression including at least one alphanumeric character, C. database access means connected with said input means and with said database storage means for accessing information stored in said linguistic expression database, said database access means including master lexicon access means for addressably accessing each said lexicon storage block according to its skeletal collation range, said skeletal collation range being defined by upper and lower bounds of a collation sequence of linguistically salient word skeletons of said one or more linguistic expressions represented within a lexicon storage block, and D. database verification means connected with said database access means for locating within said linguistic expression database a linguistic expression matching suspect expression, said database verification means including master lexicon verification means for matching said suspect expression with a linguistic expression represented within said master lexicon means, and E. output means connected with said database verification means for generating a signal indicative of the success of locating a matching database expression. 14. An apparatus according to claim 11 wherein said master lexicon verification means comprises differential decoding means responsive to a differential coding of a first lexicon entry for generating a signal representative of a linguistic expression, said differential encoding being representative of a difference in character content between the linguistic expression represented in said first lexicon entry and a second linguistic expression represented in a second said lexicon entry.