Clean up the narrative about canonical and version from at "uri" search parameter ( http://build.fhir.org/search.html#uri), to read: "Note that for uri search parameters that search the canonical urls of conformance resources (e.g. StructureDefinition.url, ValueSet.url, etc), servers SHOULD support searching by Canonical URLs , and SHOULD support automatically detecting a | [version] portion, and interpreting that portion as a search on the version element of such conformance resources." * Make sure that all search parameters that search on elements of type 'canonical' are using the search type "reference". * Explain somewhere (at the definition of canonical?) why Conformance.url itself is not a canonical. * Correct the sentence "_tag, _profile and _security parameters are all token types (see below)." in http://hl7.org/fhir/search.html#profile, since _profile is a canonical, thus searched by a reference search type * The section on Reference search parameters is already substantial and should additionally talk about using [|version] (and business versions). Since there is already narrative on _history "versioned references", this might quickly become confusing to the reader. We suggest splitting up this section in several parts: 1) text relevant to both canonicals and References, 1) text specific to references (like _history) and 2) text specific to canonicals. And be carelful not to use the phrase "version specific", so we better use "canonical with version" or "reference with _history" or somesuch.