## Validator Changes
* New Feature: Validating references: parameters -check-references and -resolution-context
* New Feature: Use AI Service to validate CodeableConcept.text (very experimental)
* Add AI validation tests as a command line option ([-aiTests](https://chat.fhir.org/#narrow/channel/323443-Artificial-Intelligence.2FMachine-Learning-.28AI.2FML.29/topic/LocalAI))
* Don't enforce code system property references to standard properties in R4 (R4 hack workaround)
* Correctly handle supplements when validating based on expansions
* Fix issues with version dependent resolution of correct server for implicit value sets
* Better handle failure to find imported value sets when expanding
* correct error handling for expansion failure
* Correct grammar in language about resource not being valid against a profile
* use IPS 2.0.0 for `-ips`, not an old copy
* Fix NPE generating snapshots with expansions
* Rework `-txTests` to support additional test files and improve R4/R5 logging
* Fix bugs in RulesDrivenPolicyAdvisor
* Accept property in CodeSystem without requiring it be backed by a code
* Add issue when extension is deprecated
## Other code changes
* Track & report expansion source when rendering ValueSet expansions
* Render ValueSet supplement dependencies
* Add server headers to fhir-settings.json
* find places where ManagedFileAccess was missed
* Fix Actor rendering in obligations tables
* Renderer: move xml-no-order to tools ig
* Resource Factory: support for range in sheet for instance generation (#1881)
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## Validator Changes
* Do not create issue about draft dependency for example bindings
* Beef up validation of CodeSystem properties that are codes
* Make sure all validation messages have a message id
* Validator enforce version-set-specific value for Extension and Extension context
* Specific Error when ValueSet.compose.include.system refers to a ValueSet
* Fix NPE processing code system supplements
## Other code changes
* Report count of tests in output from TxTester
* resolve issues with references between IGs to example resources
* Lookup compliesWithProfile target from link-only dependencies
* Update SNOMED editions related routines (add more editions)
* Accessibility - role=presentation on appropriate tables
* Add support for ADL in packages
* Support for Archetype processing in IG publisher
* Lazy load binaries for reduced memory usage
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## Validator Changes
* Validate that ConceptMap references to ValueSets are actual value sets
* Check if abstract classes have concrete subtypes in scope
* Handle tx ecosystem failure properly
* fix for CLI Should Fail with Non-Zero Exit Code on TX Test Errors
## Other code changes
* Add support for multiple lines in the first cell in heirarchical tables
* Also add support for suppressing lines and inner borders
* Add support for table.rows in TestDataFactory
* Add Element View for non-technical readers of profiles
* Improved Rendering for Timing Datatype
* Fix for handling SD extensions when generating snapshots
* Don't remove bindings from types with characteristics = can-bind (Extensions in R5)
* Various minor Fixes for generating snapshots for archetypes (checking type parameters)
* Fix logback configs + update logback (#1868)
* .qos.logback-logback-core-1.5.13: Fix inclusion of logback-test in jar and fix classpath log configs
* Fix LoggingPolicy enum (use SLF4J)
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## Validator Changes
* Christmas 2025 Add new command option to validator: [test instance factory](https://confluence.hl7.org/display/FHIR/Using+the+FHIR+Validator#UsingtheFHIRValidator-GeneratingTestInstancesusingFactories)
* Fix validation of invariants in profiles - check for more conflicts, and don't call conflict if the expression is the same
* Fix issues with tracking supplement usage and getting supplement version matching correct
* Fix npe loading old simplifier package
## Other code changes
* Fix handling of ValueSetVersion parameter in txTests
* Test Instance Generation, and many fixes to PE model
* Fix logical model rendering to use type characteristics for can-be-target
* Only use profiled datatype information for generating snapshots for Resource and Extension
* Fix comparison template loading issue
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## Validator Changes
* Start removing R2 support- add note that it's not officially supported anymore
* Add support for finding the existence of implicit value sets
* move tx tests to tx-ecosystem IG and change -txTests parameters
* Switch priority order of package servers (packages2.fhir.org is not rate limited)
* Fix issue with value set version conversion on contains.property (Check for both "value" and "value[x]")
* Fix error message validating ConceptMap when size too large
## Other code changes
* Security fix: Bump ucum to 1.0.9
* Add XhtmlToMarkdown library
* Add support for THO rendering of NamingSystem information
* Add profile-based sample instance generation (WIP)
* fixes for snapshot generation test debugging
* Add support for languages to npm package and package list
* fix rendering issues - resources with no id, and urn: references shouldn't be links
* fix regex escapes in R5 Constants regex for RESTful references
* Improvements to translation file generation (better path, eliminate duplicates)
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