October 1, 1979 KEYWORD STRINGS
KEYWORD SPECIFICATION
RESTRICTIONS ____________
• Keyword strings can be no longer than 255 characters in total.
• Each Keyword, Attribute, or Value is limited to 16 characters.
not allowed • The following characters are ___________ in a Keyword:
SYMBOL NAME REASON ______ ____ ______
; semi-colon Keyword separator
: colon Attribute-Value delimiter
, comma Weight delimiter
&,,¬,(,) boolean operators must be distinguishable for
a retrieval request
b / blank internal restriction
Figure C.1 -- Illegal Keyword Characters ________________________________________
EXAMPLES ________
• In a file consisting of popular song titles a user might wish
to distinguish between those for which an author wrote the
music and those for which he wrote the lyrics. The user could
assign the Attribute-Value pairs:
composer:Irving_Berlin
lyricist:Irving_Berlin
"design;graphics:interactive;text-processing,6" _______________________________________________
this is a Keyword string containing the Keywords "design"
and "text-processing" (the latter with a Weight of 6); it
also contains the Attribute-Value pair
"graphics:interactive."
FRESS Resource Manual Release 9.1 FRESS Appendix C.1 -- 269
KEYWORD SPECIFICATION
RESTRICTIONS ____________
• Keyword strings can be no longer than 255 characters in total.
• Each Keyword, Attribute, or Value is limited to 16 characters.
not allowed • The following characters are ___________ in a Keyword:
SYMBOL NAME REASON ______ ____ ______
; semi-colon Keyword separator
: colon Attribute-Value delimiter
, comma Weight delimiter
&,,¬,(,) boolean operators must be distinguishable for
a retrieval request
b / blank internal restriction
Figure C.1 -- Illegal Keyword Characters ________________________________________
EXAMPLES ________
• In a file consisting of popular song titles a user might wish
to distinguish between those for which an author wrote the
music and those for which he wrote the lyrics. The user could
assign the Attribute-Value pairs:
composer:Irving_Berlin
lyricist:Irving_Berlin
"design;graphics:interactive;text-processing,6" _______________________________________________
this is a Keyword string containing the Keywords "design"
and "text-processing" (the latter with a Weight of 6); it
also contains the Attribute-Value pair
"graphics:interactive."
FRESS Resource Manual Release 9.1 FRESS Appendix C.1 -- 269
