The FDSN StationXML schema and related documents are maintained by the International Federation of Digital Seismograph Networks (FDSN).
StationXML is a schema definition for representing the Standard for the Exchange of Earthquake (SEED) metadata in XML.
SEED and StationXML are maintained by FDSN Working Group II.
Approved releases are available from http://www.fdsn.org/xml/station/.
Proposed additions to the schema should be created to a branch of master and a pull request should be opened. Once the addition has been approved by the FDSN it will be merged with the master branch and included in the next release.
For discussion of a potential change without creating a branch an issue should be created. If the issue is likely to result in changes to the schema it is recommended that the individual or organization proposing the change to do so in a branch for review.
Changes and issues should only be grouped together when logically related in order to streamline review and acceptance.