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The list of package patterns is ordered and earlier patterns are applied before later patterns. For example, if you specify "org.foo.*,!org.foo.impl" the second pattern has no effect ; insteadsince all org.foo packages have already been selected by the first pattern. Instead, you should specify "!org.foo.impl,org.foo.*", which will export all org.foo packages except org.foo.impl.

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The <Import-Package> instruction is a list of packages that are required by the bundle's contained packages. The default for this header is "*", resulting in importing all referred packages. This header therefore rarely has to be specified. However, in certain cases when there is an unwanted import, such an import can be removed by using a negation package pattern. The package patterns work in the same way as for <Export-Package>, which means they are ordered. For example, if you wanted to import all packages except org.foo.impl you would specify "!org.foo.impl,*"

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