Getting the length between two points

Hi All,
I am trying to get the distance between two points and came across the SDO_LENGTH function in the manual - however there is no example on how to use it.
I was expecting the following statement to return me the value 9 but instead I am getting errors along the lines of SDO_GEOM.SDO_LENGTH must be declared etc.
=============================================
SDO_GEOM.SD0_LENGTH(
MDSYS.SDO_GEOMETRY(2
,NULL
,NULL
,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1)
,MDSYS.SDO_ORDINATE_ARRAY(1,1,10,10))
,MDSYS.SDO_DIM_ARRAY(MDSYS.SDO_DIM_ELEMENT('X',-180,180,0.0001)
,MDSYS.SDO_DIM_ELEMENT('Y',-90,90,0.0001))
============================================
what am I missing
any help appreciated
Brent Glover

I think I have found my answer
============================================
DECLARE
v_length NUMBER;
BEGIN
v_length := SDO_GEOM.SDO_LENGTH(
MDSYS.SDO_GEOMETRY(2
,NULL
,NULL
,MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1)
,MDSYS.SDO_ORDINATE_ARRAY(1,1,10,10))
,MDSYS.SDO_DIM_ARRAY(MDSYS.SDO_DIM_ELEMENT('X',-180,180,0.0001)
,MDSYS.SDO_DIM_ELEMENT('Y',-90,90,0.0001))
DBMS_OUTPUT.put_line(v_length);
END;
=============================================

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