(Required) Colon separated list of product attributes to query for.
streams are specified as a colon separated list of '<site>.<instrument>.<stem_name>.<product_level>[.<version_number>].' If the version number isn't specified, the most recent one is used. <b>Note</b>: level and version is abbreviated
(i.e. level_00 becomes l00 and version_00 becmes v00).
streams are specified as a colon separated list of '<site>.<instrument>.<product_id>.<product_level>.<version_number>'.
The version number may be specificed as '*' to choose the most recent version.
The product ID may also be specified as '*' to choose all products for a given level.
<br><b>Note</b>: level and version is abbreviated
(i.e. level_00 becomes l00 and version_00 becomes v00).
Valid streams quantifiers for each site/instrument are documented below.