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11 Packages  11.1 Package Concepts 11.1.1 Introduction to Packages 11.1.1.2 Symbols in a Package
11.1.1.2.1 Internal and External Symbols
The mappings in a package are divided into two classes, external and internal.
The symbols targeted by these different mappings
are called external symbols and internal symbols of the
package. Within a package, a name refers to one
symbol or to none; if it does refer
to a symbol, then it is either external or internal in that
package, but not both.
External symbols
are part of the package's public interface to other packages.
Symbols become external symbols of a given
package if they have been exported from that package.
A symbol has the same name no matter what package
it is present in, but it might be an external symbol of some packages
and an internal symbol of others.
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