Q1

If an editor complains of a missing document provider, install an instance of TextFileDocumentProvider with the setDocumentProvider() method on the editor.

Q2

An IResourceProxy is used by a builder to provide a wrapper around an IResource, but one which doesn't require the construction of an IResource image.

Q3

An IPath is a generic file component that is used to navigate files in folders and projects.

Q4

A nature is a flavor of a project, which enables certain behaviors. It is installed with an update to the project descriptor for the given project.

Q5

Markers are generally created by a builder though they can be created by any plug-in on a resource. There is a specific function on resource which can be used to create a marker of a specific type.