added property related IDs as public attributes to property service

added property service to kernel guide

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/services/IPropertiesService.java

@@ -34,4 +34,14 @@ public interface IPropertiesService {
 
 	/** The tabbed property sheet contributor ID. */
 	public static final String TABBED_PROPERTY_CONTRIBUTOR_ID = "org.fortiss.tooling.kernel.properties.Contributor";
+
+	/** The property category used for all sections of the contributor. */
+	public static final String PROPERTY_CATEGORY = "main";
+
+	/** The ID of the general properties tab. */
+	public static final String GENERAL_PROPERTY_TAB_ID = "org.fortiss.tooling.kernel.property.tab.general";
+
+	/** The ID of the internal properties tab. */
+	public static final String INTERNAL_PROPERTY_TAB_ID = "org.fortiss.tooling.kernel.property.tab.internal";
+
 }