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Flex 4 Namespaces

Flex 4 introduces four namespaces: MXML 2006, MXML 2009, Spark, and Halo.

All the Flex 3 applications can be compiled in Flex 4 beta using MXML 2006 namespace. It’s using default prefix mx.

MXML 2009 is language namespace, which dose not contain component tags and it’s using fx as a prefix.

Spark namespace is used in conjunction with the MXML 2009 language namespace. Spark using s as prefix.

Holo namespace includes all Halo components. And same as Spark it should be used in conjunction with the MXML 2009 language namespace. It ‘s using mx as prefix.

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