Meaning of key words NDC, SCHEMA, ATTRIBUTE, AGGEGATE , Diffrence between

Hi,
pls guide me what is the meaning of following key words.
1.NDC
2. SCHEMA
3. ATTRIBUTE
4. AGGEGATE
5.Diffrence between TRANSFORM AND TRANSACTION
I searched in google but it given not only DBMS/RDBMS information but other related information also.
pls guide me.
Regards,
Venkat

http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/toc.htm

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Suppose we say:
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Meaning of key words NDC, SCHEMA, ATTRIBUTE, AGGEGATE , Diffrence between

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