This project contains all the core search parameters that are available in the STU3 FHIR specification.
Each FHIR resource can be searched by a couple of common parameters (e.g.
_tag) and the additional search parameters that are specified for this resource. When you scroll down in the Content tab of the documentation of a Resource in the FHIR specification, you find the search parameters defined for that resource. The XML/JSON version for those search parameters can be found in this project. You can also find a list of all search parameters here: https://www.hl7.org/STU3/fhir/searchparameter-registry.html