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| 6 Iteration 6.1 The LOOP Facility 6.1.2 Variable Initialization and Stepping Clauses 6.1.2.1 Iteration Control ### 6.1.2.1.7 The for-as-package subclause In the for-as-package subclause the `for` or `as` construct iterates over the symbols in a package. In this syntax, a compound preposition is used to designate access to a package. The variable var takes on the value of each symbol in the supplied package. The following loop keywords serve as valid prepositions within this syntax: `being` The keyword `being` introduces either the Loop schema `symbol`, `present-symbol`, or `external-symbol`. `each`, `the` The loop keyword `each` follows the loop keyword `being` when `symbol`, `present-symbol`, or `external-symbol` is used. The loop keyword `the` is used with `symbols`, `present-symbols`, and `external-symbols` only for ease of reading. This agreement isn't required. `present-symbol`, `present-symbols` These Loop schemas iterate over the symbols that are present in a package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled. `symbol`, `symbols` These Loop schemas iterate over symbols that are accessible in a given package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled. `external-symbol`, `external-symbols` These Loop schemas iterate over the external symbols of a package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled. `in`, `of` These loop prepositions introduce package. In effect `being` `{``each` | `the``}` `{``symbol` | `symbols` | `present-symbol` | `present-symbols` | `external-symbol` | `external-symbols``}` `{``in` | `of``}` is a compound preposition. Iteration stops when there are no more symbols to be referenced in the supplied package. 6.1.2.1.7.1 Examples of for-as-package subclause

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