# API Baselines Preferences

The following preferences can be set using the Plug-in Development > API Baselines preference page.

An API baseline defines the state you want to compare your development workspace bundles against for the purposes of binary compatibility, bundle version numbers, and @since tags. For example, if you are developing bundles for Eclipse 3.4, you could use Eclipse 3.3 as your baseline.

Option | Description | Default
--- | --- | ---
Add Baseline... | Allows you to add a new API baseline. |
Edit... | Allows you to edit a selected API baseline. |
Remove | Allows you to remove the selected API baseline(s). |
Missing API baseline | This preference is used to notify you when the API builder is going to run and you do not have a default API baseline set. | Error

Setting up an API baseline

PDE Preferences
API Errors and Warnings Preferences
Missing API Baseline Quick Fix
API Baseline Wizard
API Use Scans Preferences