diff -U 3 -H -d -r -N -- lilv-0.14.4.old/lilv/lilv.h lilv-0.14.4/lilv/lilv.h
--- lilv-0.14.4.old/lilv/lilv.h	2012-09-07 19:00:48.464571333 +0100
+++ lilv-0.14.4/lilv/lilv.h	2012-09-07 18:54:00.626548936 +0100
@@ -1693,6 +1693,25 @@
 lilv_ui_get_binary_uri(const LilvUI* ui);
 
 /**
+  Custom calls
+*/
+LILV_API
+LilvNodes*
+lilv_ui_get_supported_features(const LilvUI* ui);
+
+LILV_API
+LilvNodes*
+lilv_ui_get_required_features(const LilvUI* ui);
+
+LILV_API
+LilvNodes*
+lilv_ui_get_optional_features(const LilvUI* ui);
+
+LILV_API
+LilvNodes*
+lilv_ui_get_extension_data(const LilvUI* ui);
+
+/**
    @}
    @}
 */
diff -U 3 -H -d -r -N -- lilv-0.14.4.old/lilv/lilvmm.hpp lilv-0.14.4/lilv/lilvmm.hpp
--- lilv-0.14.4.old/lilv/lilvmm.hpp	2012-07-18 02:42:43.000000000 +0100
+++ lilv-0.14.4/lilv/lilvmm.hpp	2012-09-07 18:53:14.134318379 +0100
@@ -136,6 +136,7 @@
 struct Nodes {
 	LILV_WRAP_COLL(Nodes, Node, nodes);
 	LILV_WRAP1(bool, nodes, contains, const Node, node);
+        LILV_WRAP0(Node, nodes, get_first);
 };
 
 struct Port {
@@ -167,6 +168,26 @@
 	const LilvPort*   me;
 };
 
+struct UI {
+    inline UI(const LilvUI* c_obj) : me(c_obj) {}
+    LILV_WRAP_CONVERSION(const LilvUI);
+
+    LILV_WRAP0(Node, ui, get_uri);
+    LILV_WRAP1(bool, ui, is_a, LilvNode*, ui_class);
+    LILV_WRAP0(Node, ui, get_bundle_uri);
+    LILV_WRAP0(Node, ui, get_binary_uri);
+    LILV_WRAP0(Nodes, ui, get_supported_features);
+    LILV_WRAP0(Nodes, ui, get_required_features);
+    LILV_WRAP0(Nodes, ui, get_optional_features);
+    LILV_WRAP0(Nodes, ui, get_extension_data);
+
+    const LilvUI* me;
+};
+
+struct UIs {
+    LILV_WRAP_COLL(UIs, UI, uis);
+};
+
 struct Plugin {
 	inline Plugin(const LilvPlugin* c_obj) : me(c_obj) {}
 	LILV_WRAP_CONVERSION(const LilvPlugin);
@@ -190,6 +211,8 @@
 	LILV_WRAP0(Node,        plugin, get_author_email);
 	LILV_WRAP0(Node,        plugin, get_author_homepage);
 	LILV_WRAP0(bool,        plugin, is_replaced);
+        LILV_WRAP0(Nodes,       plugin, get_extension_data);
+        LILV_WRAP0(UIs,         plugin, get_uis);
 
 	inline Port get_port_by_index(unsigned index) {
 		return Port(me, lilv_plugin_get_port_by_index(me, index));
diff -U 3 -H -d -r -N -- lilv-0.14.4.old/src/ui.c lilv-0.14.4/src/ui.c
--- lilv-0.14.4.old/src/ui.c	2012-09-07 19:00:48.464571333 +0100
+++ lilv-0.14.4/src/ui.c	2012-09-07 18:59:51.652289664 +0100
@@ -128,3 +128,57 @@
 	assert(ui->binary_uri);
 	return ui->binary_uri;
 }
+
+static LilvNodes*
+lilv_ui_get_value_internal(const LilvUI* ui,
+                           const SordNode*   predicate)
+{
+    return lilv_world_query_values_internal(
+        ui->world, ui->uri->node, predicate, NULL);
+}
+
+LILV_API
+LilvNodes*
+lilv_ui_get_supported_features(const LilvUI* ui)
+{
+    LilvNodes* optional = lilv_ui_get_optional_features(ui);
+    LilvNodes* required = lilv_ui_get_required_features(ui);
+    LilvNodes* result   = lilv_nodes_new();
+
+    LILV_FOREACH(nodes, i, optional)
+        zix_tree_insert((ZixTree*)result,
+                        lilv_node_duplicate(lilv_nodes_get(optional, i)),
+                        NULL);
+    LILV_FOREACH(nodes, i, required)
+        zix_tree_insert((ZixTree*)result,
+                        lilv_node_duplicate(lilv_nodes_get(required, i)),
+                        NULL);
+
+    lilv_nodes_free(optional);
+    lilv_nodes_free(required);
+
+    return result;
+}
+
+LILV_API
+LilvNodes*
+lilv_ui_get_required_features(const LilvUI* ui)
+{
+    return lilv_ui_get_value_internal(
+        ui, ui->world->uris.lv2_requiredFeature);
+}
+
+LILV_API
+LilvNodes*
+lilv_ui_get_optional_features(const LilvUI* ui)
+{
+    return lilv_ui_get_value_internal(
+        ui, ui->world->uris.lv2_optionalFeature);
+}
+
+LILV_API
+LilvNodes*
+lilv_ui_get_extension_data(const LilvUI* ui)
+{
+    return lilv_ui_get_value_internal(ui, ui->world->uris.lv2_extensionData);
+}