OptionaloparlOnly entries speaking this OParl version: 1.0, 1.1, or a version URI.
OptionalsearchOnly entries whose title, URL or note contains this text, ignoring case, Unicode
form and accents (ß = ss); when nothing matches literally, the ae/oe/ue
umlaut spellings are tried (koeln finds Köln). Must not be blank.
Optionalsource"all" (default): the registry followed by the curated list; or either one alone.
OptionalworkingOnly entries that worked on their last check.
The options of
endpoints(): the source, and the filters applied to its entries.