> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/reference-sets/reference-set-types/map-type-reference-sets.md). # Map type Reference Sets Maps can be created in form of different types of Map type Reference Sets. When you are defining a map, you are linking components from one terminology (as the source) to components with similar meaning from another terminology (which would be called the mapping target). Map type Reference Sets represent cross-links between terminologies. Map type Reference Sets are a SNOMED CT standard mapping SNOMED as the source to a specified target terminology. * Simple Maps represent one-to-one relationships. * Complex Maps and Extended Maps allow mappings from SNOMED CT to multiple codes in the target scheme and defining rules. These maps can be exported in RF2 format. Snow Owl provides a variety of mapping methods for creating association mappings between different terminologies or external codes, Code Systems. Simple, Complex, and Extended Map type Reference Sets are organized in the Reference Set View and can be opened by double-clicking. ![Map Type Reference Sets in the Reference Sets View](/files/h7pPatgAXNSizqRysiBM) The editor is used to filter, review or make changes to the mappings (e.g. add members, inactivate members). The user interface of the editor changes, depending on the type of map. **Map type Reference Sets** * ![](/files/-M286fNiaIbJIkkJJkwA) Simple Map type Reference Set * ![](/files/-M286fNcahI8ICyY44_p) Simple Map type with Description Reference Set * ![](/files/-MVH2MHedKsUIWjXsHSf) Complex Map type Reference Set * ![](/files/-MVH2MHf1uly8vHg51-Y) Complex Map Extended with Map Block type Reference Set * ![](/files/-M286fNlIRRzRICThHp-) Extended Map type Reference Set ### Updating Map Target Although SNOMED CT and its RF2 serialization format do not specify a formal map target type, Snow Owl allows the map target component type to be specified for new or imported Map type Reference Sets. To set the map target component type for Reference Sets right-click on the Reference Set and select the ![](/files/zULeeQmjUv88eGvMAKAM) *Update map target component type...* Context Menu option. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.b2ihealthcare.com/snow-owl-authoring-platform/reference-sets/reference-set-types/map-type-reference-sets.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.