If you know the name of the library package in question, simply look
at the source code in qplib3.5. Apart from code
comments, there is information about predicates in two files that
summarize the contents of the directory. They are called Contents and
Index. (See the figure above.) If you do not know the name of the
package the Index file will be helpful. If you know the name of the
package, you can use the Contents file to gain further information
about it.
The Index file contains one line for each exported predicate in
the library. The predicates are listed in standard
order, ignoring module names. A typical
entry looks like this:
list_to_binary/4 flatten ./flatten.pl
This means that there is a predicate called list_to_binary/4 in
the library, that it lives in a module called flatten, and
that the file that contains it is flatten.pl in the same
directory as the Index.
If you have set up an environment variable QL holding the
name of the Quintus library directory, you could ask
"what predicates are there to deal with files?" by issuing
the command
% egrep files $QL/Index
The Contents file is organized by library files rather than by
predicates. A typical entry in this file is a block of lines like
this:
basics + documented in manual
basics % the basic list processing predicates
basics - ./basics.pl
basics : member/2
basics : memberchk/2
basics : nonmember/2
The first line means that library(basics) is one of the library
packages that is fully documented in this manual. The second line is
a short description of the contents. The third line says which file
contains library(basics); in this case it is basics.pl in the same
directory as Contents. The remaining lines list the predicates
exported by library(basics). You could obtain this information by
issuing the command
% egrep '^basics' $QL/Contents
These files are provided as a convenience, and do not have the same authority as the printed manual.