How can UML be extended?

OMG OMG-OCUP-300 Question Answer

How can UML be extended? (Choose two)

using Interface Definition Library (IDL)

using the Object Constraint Language (OCL)

using XML Metadata Interchange (XMI)

using profiles

reusing part of the UML infrastructure library and augmenting it with metaclasses and relationships

OMG-OCUP-300 PDF/Engine

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