# 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://app.gitbook.com/o/h8Z6qGxuQrzM9vbx5bPT/s/irKbJsZG57nSWZA4GT0M/).

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