> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-extension-guide/4-logical-design/4.3-extensions/4.3.1-components.md).
# Components
Most extensions include additional concepts, descriptions and/or relationships. It is therefore important for extension producers to understand the logical design of these components, and any extension-specific rule related to these components.
The following subsections present logical design rules and considerations for components in an extension:
* Common Attributes
* Concepts
* Descriptions
* Relationships
For information about the process of authoring extension components, please refer to [Authoring](https://github.com/SNOMED-Documents/extension-guide/blob/main/5%20key-steps/5.4%20authoring). For a full list of RF2 component tables and their attributes, please refer to the [SNOMED CT Release File Specifications](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-release-file-specification/).
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