Again: ORA-13349 (Self-touch)

Question

I know this topic has been discussed several times.
My question is, how to store my land use data as shown in picture linked below:
http://mroy.wordpress.com/files/2006/07/ora-13349.jpg
Bunch of polygon "B" touched each other, so it's caused polygon "A" self touched.
Should I manipulate the data, while the data it self is real-world data? Why ESRI ArcGIS topology doesn't think this is an error?
TIA,
Roy Irwan

Answer 1

Bryan Hall wrote:
I would hazard to guess that the polygons inside the
multipolygon don't touch, but actually overlap.Well, actually they are touched each other. They have exactly the same coordinate at one vertex, that's why I call it 'touched'.
From the ESRI Shape validation page found at the
bottom of this document:
http://edndoc.esri.com/arcsde/9.0/general_topics/shape
_validation.htm
* Multipart area shapes may not overlap. However, two
parts may touch at a point.Good article. As I told you, my data has been validated by ArcGIS, and they are all valid.
For SDO_GEOMETRY multipolygons:
There can be no shared area between polygons
Different polygons can touch each other at point
locations, but the boundaries cannot run along each
other.I completely clear about the rules. But why? Why can't we have touched polygons covered by other polygon? Even this is the real condition?
Rgds,
Roy Irwan