OPAL Metadata Verbs

Verb	Description
add_key	Add a candidate key to the output. The candidate key…
colenum	Mark columns as enumerations, or not, by name….
colimmutable	Mark resource columns as time immutable a.k.a….
colshow	Show or hide columns by name. Arguments are colname:…
droptime	Clear the valid from (and the valid to), turning…
interface	Map fields of this dataset to a pre-defined interface.
make_event	Given a resource, make_event will demote it to a…
make_resource	Convert an event table to a resource with the…
make_session	Group events or intervals that are close to each…
merge_events	Merge consecutive events into new events based on…
set_label	Declare the ‘label’ of the output to be the designat…
set_link	Add a foreign key to the output. The foreign key…
set_metric	Register a metric, with its metadata defined in an…
set_primary_key	Declare the primary key of the output as consisting…
set_valid_from	Declare the valid from of the output to be the…
set_valid_to	Declare the ‘valid to’ of the output to be the named…
unset_keys	Remove the primary and candidate key declarations…
unset_link	Drop a foreign key by specifying the foreign keys…