Package-level Javadoc

Application programming interfaces and classes for source lookup.

## Package Specification

Provides support for source lookup.

These classes and interfaces have been deprecated in Eclipse 3.0. Source lookup facilities are now provided by the debug platform - see `org.eclipse.debug.core.sourcelookup`. Source lookup support specific to the Java debugger is now provided in `org.eclipse.jdt.launching.sourcelookup.containers`.