The details of all the public APIs for UIMA are contained in the API JavaDocs. These are located in the docs/api directory; the top level to open in your browser is called index.html.

In recent releases, Eclipse supports the ability to attach the JavaDocs to your project. To use this facility, open a project which is referring to the UIMA APIs in its class path, and open the project properties.

Once you do this, Eclipse can show you JavaDocs for UIMA APIs as you work. To see the JavaDoc for a UIMA API, highlight the API class or method and press shift-F2, or use the menu Navigate -> OpenExternalJavaDoc. This will open the JavaDoc for the selected item in a browser.