Index: app/models/metadata.php
===================================================================
--- app/models/metadata.php     (revision 1212)
+++ app/models/metadata.php     (working copy)
@@ -20,9 +20,11 @@
                $this->load();
        }
        function get($key) {
+               if (!$this->loaded) $this->load();
                return array_key_exists($key, $this->attributes) ? $this->attributes[$key] : '';
        }
        function set($key, $value) {
+               if (!$this->loaded) $this->load();
                if (!array_key_exists($key, $this->attributes)) {
                        insert('metadata', array('model' => $this->model->model, 'model_id' => $this->model->id, 'key' => $key, 'value' => $value));
                } else {
@@ -30,6 +32,11 @@
                }
                $this->attributes[$key] = $value;
        }
+       function remove($key) {
+               if (!$this->loaded) $this->load();
+               delete_all('metadata', "model='{$this->model->model}' AND model_id={$this->model->id} AND `key`=".$this->db->quote($key));
+               $this->reload();
+       }
        function reset() {
                delete_all('metadata', "model='{$this->model->model}' AND model_id={$this->model->id}");
        }
Index: lib/model.php
===================================================================
--- lib/model.php       (revision 1212)
+++ lib/model.php       (working copy)
@@ -125,5 +125,10 @@
                $this->metadata->model = &$this; // workaround for PHP4 -_-
                $this->metadata->set($key, $value);
        }
+
+       function remove_attribute($key) {
+               $this->metadata->model = &$this; // workaround for PHP4 -_-
+               $this->metadata->remove($key);
+       }
 }
 ?>

function register_plugin($name) {
	global $__plugins;
	$plugin = Plugin::find_by_name($name);
	if ($plugin->enabled) {
		$plugin->on_init();
	}
	$plugin->name = $name;
	$__plugins[$name] = $plugin;
	ksort($__plugins);
}

class Plugin extends Model {
.
.
.
	function get_id() {
		if ($this->name)
			return $this->name;
		else
			return get_class($this);
	}