October 1, 1979 FRESS COMMANDS BLOCK TRAIL CONTINUOUS
Display
EXAMPLES ________
bt/Keyword1&key2key3
All Blocks with both Keyword1 and key2 are retrieved, as well
as all Blocks with key3.
bt/Keyword1&(key2key3)
All Blocks with both Keyword1 and key2 are retrieved, as well
as all Blocks with both Keyword1 and key3.
bt/¬key1
This request is invalid since it requests all Blocks which do
not have key1; it is not permitted to enumerate all Keyworded
Blocks (possibly hundreds).
bt/key,6
All Blocks having keys with a Weight between 15 and 6, or no
Weight (which satisfies all requests) are retrieved.
MULTIWINDOW ___________
• The block will be displayed in the specified window, or some
other than window __________ the current one, if not specified.
RESTRICTIONS ____________
• A Block Trail can consist of no more than 100 Blocks (an
internal limit).
MESSAGES ________
• Error messages occur when 1) all Keyworded Blocks are
requested, 2) a Keyword requested is not in the file, or 3) the
request is syntactically incorrect (mismatched parentheses, two
&'s in a row, etc.).
RELATED COMMANDS ________________
BTDISCRETE, TRAIL
FRESS Resource Manual Release 9.1 FRESS RSection 5.8 -- 123