The FDSN web service specifications provide a compatibility baseline for RESTful web services across multiple data centers.
The FDSN StationXML schema specifies a baseline for seismological and related metadata. Comprehensive StationXML reference documentation is maintained online, where a downloadable PDF is also available.
FDSN source identifiers define the construction of unique identifiers for data sources used in FDSN data formats and services.
FDSN recommendations for seismic network DOIs and related FDSN services describes how Digital Object Identifiers (DOIs) should be used to acknowledge networks whose data are used in other works.
Standard for the Exchange of Earthquake Data (SEED) Manual
Version 2.4 (PDF)
Updated August, 2012
The FDSN Station Book contains information about stations from all networks that contribute data (or intend to contribute data) through the FDSN.
Historical documents covering the background of the FDSN.