4 files changed, 33 insertions, 4 deletions
diff --git a/slv2/pluginclass.h b/slv2/pluginclass.h
index 1124bd8..7260d7d 100644
--- a/slv2/pluginclass.h
+++ b/slv2/pluginclass.h
@@ -30,6 +30,15 @@ extern "C" {
  */
 
 
+/** Get the URI of this class' superclass.
+ *
+ * Returned value is owned by \a plugin_class and must not be freed by caller.
+ *
+ * Time = O(1)
+ */
+const char* slv2_plugin_class_get_parent_uri(SLV2PluginClass plugin_class);
+
+
 /** Get the URI of this plugin class.
  *
  * Returned value is owned by \a plugin_class and must not be freed by caller.
@@ -39,7 +48,7 @@ extern "C" {
 const char* slv2_plugin_class_get_uri(SLV2PluginClass plugin_class);
 
 
-/** Get the label of this plugin_class, ie "Oscillators".
+/** Get the label of this plugin class, ie "Oscillators".
  *
  * Returned value is owned by \a plugin_class and must not be freed by caller.
  *
@@ -47,6 +56,17 @@ const char* slv2_plugin_class_get_uri(SLV2PluginClass plugin_class);
  */
 const char* slv2_plugin_class_get_label(SLV2PluginClass plugin_class);
 
+
+/** Get the subclasses of this plugin class.
+ *
+ * Returned value must be freed by caller with slv2_plugin_classes_free.
+ *
+ * Time = O(nclasses)
+ */
+SLV2PluginClasses
+slv2_plugin_class_get_children(SLV2PluginClass plugin_class);
+
+
 #if 0
 /** Get the path of this plugin_class, ie "Plugins/Generators/Oscillators".
  *
diff --git a/slv2/pluginclasses.h b/slv2/pluginclasses.h
index 39177b8..a9dbdc5 100644
--- a/slv2/pluginclasses.h
+++ b/slv2/pluginclasses.h
@@ -26,9 +26,6 @@ extern "C" {
 #endif
 
 
-typedef void* SLV2PluginClasses;
-
-
 /** \defgroup plugin_classes Plugin classes (categories)
  * 
  * @{
diff --git a/slv2/types.h b/slv2/types.h
index 42f2e59..7e965be 100644
--- a/slv2/types.h
+++ b/slv2/types.h
@@ -60,6 +60,10 @@ typedef struct _World* SLV2World;
 typedef struct _PluginClass* SLV2PluginClass;
 
 
+/** A collection of plugin classes.  Opaque, but valid to compare to NULL. */
+typedef void* SLV2PluginClasses;
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/slv2/world.h b/slv2/world.h
index 59b0adc..08acd2b 100644
--- a/slv2/world.h
+++ b/slv2/world.h
@@ -103,6 +103,14 @@ slv2_world_load_bundle(SLV2World   world,
                        const char* bundle_uri);
 
 
+/** Get the parent of all other plugin classes, lv2:Plugin.
+ *
+ * Time = O(1)
+ */
+SLV2PluginClass
+slv2_world_get_plugin_class(SLV2World world);
+
+
 /** Return a list of all found plugin classes.
  *
  * Returned list is owned by world and must not be freed by the caller.