O8i new feature questions - 03

[woexpert]

The following sentences are extracted from a study material.
Maybe my English is too poor to understand what they really mean. Can someone explain them in more PLAIN English to me?
Thanks a lot!

"If the object identifier is user defined, some or all columns used to define the object identifier can also be used in the partition key if needed. The partition key cannot explicitly use an object identifier."

[tamilselvan]

In 8i, user defined data type is allowed. A single object can contain one or more attributes. This object can be used in the CREATE TABLE statement.

When defining Partitioned Tables, the object identifier can not used as partition key.

I have not tried so far to create a table with object id as partition key.