Bug 55884 Loading a user library from file does not warn when overwriting an existing library [build path]
Works in I2004032400010 + plug-in export for I200403240800 Add library 'mylib'. Save it. Change it. Load library from file. ==> should warn that 'mylib' gets changed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/UserLibraryPreferencePage.java
private static final String CURRENT_VERSION= "1"; 
		private static final String TAG_ROOT= "eclipse-userlibraries"; 
		private static final String TAG_VERSION= "version"; 
		private static final String TAG_LIBRARY= "library"; 
		private static final String TAG_SOURCEATTACHMENT= "source"; 
		private static final String TAG_ARCHIVE_PATH= "path"; 
		private static final String TAG_ARCHIVE= "archive"; 
		private static final String TAG_SYSTEMLIBRARY= "systemlibrary"; 
		private static final String TAG_NAME= "name"; 
		private static final String TAG_JAVADOC= "javadoc"; 
		private static final String PREF_LASTPATH= JavaUI.ID_PLUGIN + ".lastuserlibrary";