The "use" pragma is for declaring variables and defining clone templates in an external BLUEPHRASE file.
The syntax for the use pragma consists of:
An exclamation point !
The keyword use
A sourceref containing the name of the external file to use.
The contents of the external file are parsed and placed in memory for use by the BLUEPROCESSOR, but are never emitted to the final document.
The target may be an absolute path specifying the target from the file system's root, or a relative path, specifying the target using dot notation (.\filename.blue) or dot-dot notation (..\other-dir\filename.blue).
Here is what a use pragma looks like within the body of a manuscript.