Developed an enhancement for SHACL generation in the linkml/linkml repository, focusing on improved handling of URI and CURIE types with ifabsent default values. Leveraging Python and data modeling expertise, updated the map_uri_or_curie_default_value logic to ensure default values are consistently represented as URIs during schema generation. Expanded the test suite to cover uriorcurie range types and ifabsent scenarios, validating correct Literal representations and increasing reliability for downstream consumers. The work emphasized robust testing and schema generation practices, reducing regression risk and supporting interoperability. No critical bugs were addressed, as the primary focus remained on feature development and comprehensive test coverage.