CREATE DIMENSION SKIP WHEN NULL Syntax

I noticed in Oracle 11GR2 that the CREATE DIMENSION has been enhanced to include a SKIP WHEN NULL option. Do anyone know the behaviour of this option as the documentation is relatively light?
Thanks John

I thought it was quite well described in the documentation...
http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_5006.htm#SQLRF01206
>
level_clause
The level_clause defines a level in the dimension. A level defines dimension hierarchies and attributes.
level Specify the name of the level.
level_table . level_column Specify the columns in the level. You can specify up to 32 columns. The tables you specify in this clause must already exist.
SKIP WHEN NULL Specify this clause to indicate that if the specified level is NULL, then the level is to be skipped. This clause lets you preserve the hierarchical chain of parent-child relationship by an alternative path that skips over the specified level. See hierarchy_clause .
Restrictions on Dimension Level Columns Dimension level columns are subject to the following restrictions:
All of the columns in a level must come from the same table.
If columns in different levels come from different tables, then you must specify the dimension_join_clause.
The set of columns you specify must be unique to this level.
The columns you specify cannot be specified in any other dimension.
Each level_column must be non-null unless the level is specified with SKIP WHEN NULL. The non-null columns need not have NOT NULL constraints. The column for which you specify SKIP WHEN NULL cannot have a NOT NULL constraint).

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Edited by: user1005030 on 21-ago-2011 3.18

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Fra: Bernd Alheit
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CREATE DIMENSION SKIP WHEN NULL Syntax

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