Another partitioning question

I think what my boss is asking me to do is not possible, but since I don't have much experience with partitioning I thought I'd ask here (I did read some of manuals but didn't find an answer that suited my conditions). My boss wants a table partitioned by 2 columns - seq_no and type. If the type = 'X' then it's just a range partition, but then he wants another partition that contains all data that type!='X' but is inclusive of the entire range. Is this possible?
Something like (I know this syntax isn't correct ) create table test_part(
id number(11) unique,
owner_id number(11) not null,
type varchar2(30) not null,
name varchar2(40))
partition by range(owner_id,type)
(partition p1 values less than (20000000) and type ='X' tablespace test,
partition p2 values less than (50000000) and owner_table ='X' tablespace test,
partition p3 values less than (100000000) and owner_table ='X' tablespace test,
partition p4 values less than (500000000) and owner_table ='X' tablespace test,
partition p5 values less than (1000000000) and owner_table ='X' tablespace test)
partition p6 values less that (1000000000) and owner_table !='X' tablespace test;

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