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Add description of identifiers for multiple levels, addressing #11
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chad-iris committed Aug 12, 2020
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Expand Up @@ -52,11 +52,31 @@ location, band, source and position codes into a Uniform Resource Name
(URN) as defined by `RFC 3986 <https://www.ietf.org/rfc/rfc3986>`_.
The pattern of the source identifier URN is as follows:

For identifying a network:

::

FDSN:<network>

For identifying a station within a network:

::

FDSN:<network>_<station>

For identifying a location group, ie collection of specific channels within a station:

::

FDSN:<network>_<station>_<location>

For identifying a data source, i.e. a specific channel:

::

FDSN:<network>_<station>_<location>_<band>_<source>_<position>

where the network, station and source codes are required to be
where the `network`, `station` and `source` codes are required to be
non-empty. The underscore (ASCII 95) delimiters must always be present.

Example identifiers:
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