(ddd.info)VSL Resources

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7.3.5.6 VSL Resources
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The following resources control the VSL interpreter:

 -- Resource: vslBaseDefs (class VSLDefs)
     A string with additional VSL definitions that are appended to the
     builtin VSL library.  This resource is prepended to the `vslDefs'
     resource below and set in the DDD application defaults file; don't
     change it.

 -- Resource: vslDefs (class VSLDefs)
     A string with additional VSL definitions that are appended to the
     builtin VSL library.  The default value is an empty string.  This
     resource can be used to override specific VSL definitions that
     affect the data display.  The preferred method, though, is to
     write a specific data theme (Note: Writing Data Themes).

 -- Resource: vslLibrary (class VSLLibrary)
     The VSL library to use.  `builtin' (default) means to use the
     built-in library, any other value is used as file name.

 -- Resource: vslPath (class VSLPath)
     A colon-separated list of directories to search for VSL include
     files.  The following directory names are special:
        * The special directory name `user_themes' stands for your
          individual theme directory, typically `~/.ddd/themes/'.

        * The special directory name `ddd_themes' stands for the
          installed theme directory, typically
          `/usr/local/share/ddd-3.3.12/themes/'.
     Default is `user_themes:ddd_themes:.', which means that DDD first
     searches your theme directory, followed by the system directory
     and the current directory.

   If your DDD source distribution is installed in `/opt/src', you can
use the following settings to read the VSL library from
`/home/joe/ddd.vsl':

     Ddd*vslLibrary: /home/joe/ddd.vsl
     Ddd*vslPath:    user_themes:.:/opt/src/ddd/ddd:/opt/src/ddd/vsllib

   VSL include files referenced by `/home/joe/ddd.vsl' are searched
first in the current directory `.', then in your theme directory, then
in `/opt/src/ddd/ddd/', and then in `/opt/src/ddd/vsllib/'.

   Instead of supplying another VSL library, it is often easier to
specify some minor changes to the built-in library (Note: Writing Data
Themes).