Answer: The Project Facets property page and the Add/Remove Facets wizard
are intended for managing the set of facets that are installed on a project.
When configuration of an installed facet needs to be changed, the expectation is
that the facet author will use existing Eclipse facilities to provide project
property pages. For example, the jst.java
facet is configured using
the Java Build Path, Java Code Style, and Java Compiler
property pages.