Bug 77839 Type Restriction filters confusing in container children
20041104 The build path UI shows Type Restriction filters also on container children. But all container implementation don't support the feature, nor the update. It would be better to filter the entries for M3
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/CPListElement.java
* @return Returns a boolean
	 */
	public boolean isMissing() {
		return fIsMissing;
	}
	/**
	 * Sets the 'missing' state of the entry.
	 */
	public void setIsMissing(boolean isMissing) {
		fIsMissing= isMissing;
	}
	/**
	 * Returns if a entry is exported (only applies to libraries)
	 * @return Returns a boolean
	 */
	public boolean isExported() {
		return fIsExported;
	}
	/**
	 * Sets the export state of the entry.
	 */
	public void setExported(boolean isExported) {
		if (isExported != fIsExported) {
			fIsExported = isExported;
			
			attributeChanged(null);
		}
	}
	/**
	 * Gets the project.