## Validator Changes
* Validate contextInvariant in extension definitions
* fix Typo in TI WG name
* Handle unknown constants properly in FHIRPath
* Fix handling of type ancestors at the root of FHIRPath expressions
* CDA templates with no extension value use urn:oid: not urn:hl7ii:
* Allow URL as a type of string in FHIRPath type checking
* Fix semver validation
* Fix problem resolving context in CDA invariants
## Other code changes
* Finish SQL in FHIR Implementation, but disable sql on fhir tests until package is packaged properly by next release of IG publisher
* Fixes to Search Parameter rendering per FHIR-I decision
* Fix broken links in extension references done by [[[]]]
* Fix broken links in code system rendering of parents
* Support using names in [[[markdown]]] when rendering
* Remove "profile" from tx operations
* Include checkIPSCodes and bundleValidationRules in json
***NO_CI***
## Validator Changes
* Validation by templateId for CDA
* Fix NPE validating concept maps
* Update ViewDefinition validator for change (alias -> name)
* Fix for NPE validating sql-on-fhir ViewDefinition
* Fix for index out of bounds error when extension uses itself
* Fix issue where .resolve() in FHIRPath didn't work with URL values (and fix typo in i18n system)
* Implement FHIRPath slice() function in validator
* Fix bug where Snapshot generation can run off the end of the differential
## Other code changes
* Breaking API Change: Revise FHIRPath API so hosts can evaluate expressions in custom functions
* Add package use tracking to FHIR cache for validator.fhir.org
* Support for instance-name and instance-description in IG publisher
* Element.removeExtension (support for instance-name and instance-description extensions in IG publisher)
* Split terminology service tests
* Hack for wrong URLs in subscriptions backport
* Remove dependencies for unused UI experiment
* More improvements to profile code generation
***NO_CI***
## Validator Changes
* Fix bug processing value sets containing URLs
## Other code changes
* Add initial support for http://hl7.org/fhir/tools/StructureDefinition/type-profile-style
* More work on sql-on-fhir implementation
* Allow for type parameter to custom functions in FHIRPath
* Fix bugs in processing current packages for XIG
***NO_CI***
