Attach this attribute just like the device= (3.1) attribute. This is a free standing or floating attribute.
documentation_locator is either the base filename of the documentation, or it is the complete Internet URL (Uniform Resource Locator). If it is the filename, an attempt will be made to search for it in the local gEDA share directory named documentation.
Filename example: documentation=sn74ls00.pdf
URL example: documentation=http://www-s.ti.com/sc/ds/sn74ls00.pdf