extern mlt_properties mlt_properties_new( );
extern void mlt_properties_mirror( mlt_properties this, mlt_properties that );
extern int mlt_properties_inherit( mlt_properties this, mlt_properties that );
+extern int mlt_properties_pass( mlt_properties this, mlt_properties that, char *prefix );
extern int mlt_properties_set( mlt_properties this, char *name, char *value );
extern int mlt_properties_parse( mlt_properties this, char *namevalue );
extern char *mlt_properties_get( mlt_properties this, char *name );