October 1, 1979 FRESS COMMANDS BLOCK TRAIL CONTINUOUS
Display


BT


BT Block Trail Continuous ______________________________
BTCONTINUOUS creates a logically continuous Trail of all Blocks
online whose Keywords satisfy the boolean request, for ______ perusal
not (FULLPRINT will ___ follow a Block Trail).


BTcontinuous <bool>° <wind>°


NOTES _____
<bool> defaults to the previous specification of <bool>.
Display is set at the top of the first Block.
All Blocks are displayed contiguously, one after the other.
Thus, SCROLLing over the end of a Block in a continuous Trail
will automatically cause the display to move to the top of the
next Block in the Trail. However, if Block boundaries are
crossed to find a pattern (e.g., to LOCATE through a Trail),
the Trail will be lost and must be explicitly reestablished.
This can be done by simply issuing the "Block Trail" command
without the <bool> parameter (it will default).
TRAIL may be used to travel forward or backward along the
Trail, as well as returning to the Trail if it is left.
The Block Trail environment may be left by any non-linear
travel function (e.g., DSPACE, GLABEL).
Nested Blocks will only be retrieved if each higher level Block
also satisfies the request.
If Weights are specified in the boolean request, the Blocks are
retrieved in order of Weight, from highest to lowest.
122 -- Section 5 Release 9.1 FRESS Resource Manual
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
Previous Page Next Page