Extensions are explicitly permitted by the FGDC metadata standard, and a
structure is provided in the standard to describe the characteristics of
non-standard elements that a metadata record might use. The files here
describe extensions that may be useful to some metadata authors, and they
also serve as examples depicting the flexibility of the CSDGM.
The following types of files are provided here:
Usually something.ext, this file describes the non-standard elements that can be used. The metadata processing programs (mp, cns, xtme, tkme) are made aware of the extension file by an extensions directive in the config file.
Optional file that gives short texts tkme will use to provide hints indicating whether an extended element is optional, repeatable, or some other helpful information.
Example config file that could be used to make the metadata software aware of the extension.