Convert multiline to simple line?

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0
We are processing spatial data from another source to display in our GIS environment.
The data is a set of multilines. The gtype is 2006. A typical geometry looks like:
SDO_GTYPE     2006
SDO_SRID      31370
SDO_POINT.X   NULL
SDO_POINT.Y   NULL
SDO_POINT.Z   NULL
SDO_ELEM_INFO (1,2,1, 7,2,1)
SDO_ORDINATES (105094.84, 195084.96,
               105094.54, 195080.22,
               105094.84, 195084.96,
               105094.84, 195084.96,
               105094.68, 195082.47 )Now, this is not an actual multiline... it's just encoded as a multiline, but if you look at the coordinates you'll see that the end point of the first line is the same as the beginning of the second line (105094.84, 195084.96).
A better way to encode this geometry would be:
SDO_GTYPE     2002 <---
SDO_SRID      31370
SDO_POINT.X   NULL
SDO_POINT.Y   NULL
SDO_POINT.Z   NULL
SDO_ELEM_INFO (1,2,1)
SDO_ORDINATES (105094.84, 195084.96,
               105094.54, 195080.22,
               105094.84, 195084.96, <---
               105094.68, 195082.47 )Is there a standard function in Oracle that does this conversion for me? Or do I have to write my own :)
Thanks a lot!
Rob

Rob,
Plenty of ways to skin this cat with the standard tools.
with mLine as (
select SDO_GEOMETRY(2006,31370,NULL,
SDO_ELEM_INFO_Array (1,2,1, 7,2,1),
SDO_ORDINATE_ARRAY (105094.84, 195084.96,
               105094.54, 195080.22,
               105094.84, 195084.96,
               105094.84, 195084.96,
               105094.68, 195082.47 )) as geom
from dual
select sdo_util.concat_lines(l1.geom,l2.geom) as line
from (select sdo_util.extract(geom,1) as geom from mline) l1,
       (select sdo_util.extract(geom,2) as geom from mline) l2
union all
select sdo_geom.sdo_union(geom,geom,0.005) as line
from mline l
union all
select sdo_util.remove_duplicate_vertices(sdo_geometry(2002,l.geom.sdo_srid,l.geom.sdo_point,SDO_ELEM_INFO_ARRAY(1,2,1),l.geom.sdo_ordinates),0.005) as line
from mline l;
-- Results
LINE
SDO_GEOMETRY(2002,31370,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(105094.84,195084.96, 105094.54,195080.22, 105094.84,195084.96, 105094.68,195082.47))
SDO_GEOMETRY(2002,31370,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(105094.54,195080.22, 105094.68,195082.47, 105094.84,195084.96))
SDO_GEOMETRY(2002,31370,NULL,SDO_ELEM_INFO_ARRAY(1,2,1),SDO_ORDINATE_ARRAY(105094.84,195084.96, 105094.54,195080.22, 105094.84,195084.96, 105094.68,195082.47))Note how SDO_UNION reorganizes and cleans up the linestring which you may not want.
regards
Simon

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