Index: category.php
===================================================================
--- category.php	(revision 15497)
+++ category.php	(working copy)
@@ -76,10 +76,12 @@
  * @param int|object $category Category ID or Category row object
  * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N
  * @param string $filter Optional. Default is raw or no WordPress defined filter will applied.
+ * @param string $taxonomy Optional. Default is 'category'.
  * @return mixed Category data in type defined by $output parameter.
  */
-function &get_category( $category, $output = OBJECT, $filter = 'raw' ) {
-	$category = get_term( $category, 'category', $output, $filter );
+function &get_category( $category, $output = OBJECT, $filter = 'raw', $taxonomy = 'category' ) {
+	$taxonomy = apply_filters( 'get_category_taxonomy', $taxonomy, $category );
+	$category = get_term( $category, $taxonomy, $output, $filter );
 	if ( is_wp_error( $category ) )
 		return $category;