Content-type-based editor lookup

Explains the retionale behind Content-type-based editor lookup.

Here is a paper with the details.

To have project specific content matcher, 3.1 added IProject.getContentTypeMatcher()

Here is a document that describes the BinarySignatureDescriber (for binary content types) and XMLRootElementContentDescriber. They can be used in the org.eclipse.core.runtime.contentTypes extension point to define a content type.