What is the package-visible class?

I am reading JCVM2.2.1 Spec.
I don't know what the package-visible class is?
for example,
Here is a sentence I could not understand.
A public class cannot contain a public or protected field of type reference to a package-visible class.
However, I know a general Access controls such as public, protected and private.
Help me?
What is the package-visible class in Java Card?

There is something called package protected in Java. This means that an object may be accessible thru a package only. Sort of like public with limited visibility.
Search the Java 2 Tutorial.

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