1.1.2 Structure

1. This International Standard contains thirteen sections, fourteen annexes, and an index.
2. The core of the Ada language consists of:
   1. Sections 1 through 13
   2. Annex A, "Predefined Language Environment"
   3. Annex B, "Interface to Other Languages"
   4. Annex J, "Obsolescent Features"

1. The following Specialized Needs Annexes define features that are needed by certain application areas:
   1. Annex C, "Systems Programming"
   2. Annex D, "Real-Time Systems"
   3. Annex E, "Distributed Systems"
   4. Annex F, "Information Systems"
   5. Annex G, "Numerics"
   6. Annex H, "Safety and Security"

1. The core language and the Specialized Needs Annexes are normative, except that the material in each of the items listed below is informative:
   1. Text under a NOTES or Examples heading.
   2. Each clause or subclause whose title starts with the word "Example" or "Examples".

1. All implementations shall conform to the core language. In addition, an implementation may conform separately to one or more Specialized Needs Annexes.
2. The following Annexes are informative:
   1. Annex K, "Language-Defined Attributes"
   2. Annex L, "Language-Defined Pragmas"
   3. Annex M, "Implementation-Defined Characteristics"
   4. Annex N, "Glossary"
   5. Annex P, "Syntax Summary"

1. Each section is divided into clauses and subclauses that have a common structure. Each section, clause, and subclause first introduces its subject. After the introductory text, text is labeled with the following headings:
   Syntax
   
2. Syntax rules (indented).
   Name Resolution Rules
   
3. Compile-time rules that are used in name resolution, including overload resolution.
   Legality Rules
   
4. Rules that are enforced at compile time. A construct is legal if it obeys all of the Legality Rules.
   Static Semantics
   
5. A definition of the compile-time effect of each construct.
   Post-Compilation Rules
   
6. Rules that are enforced before running a partition. A partition is legal if its compilation units are legal and it obeys all of the Post-Compilation Rules.
   Dynamic Semantics
   
7. A definition of the run-time effect of each construct.
   Bounded (Run-Time) Errors
   
8. Situations that result in bounded (run-time) errors, See section 1.1.5 Classification of Errors.
   Erroneous Execution
   
9. Situations that result in erroneous execution, See section 1.1.5 Classification of Errors.
   Implementation Requirements
   
10. Additional requirements for conforming implementations.
    Documentation Requirements
    
11. Documentation requirements for conforming implementations.
    Metrics
    
12. Metrics that are specified for the time/space properties of the execution of certain language constructs.
    Implementation Permissions
    
13. Additional permissions given to the implementer.
    Implementation Advice
    
14. Optional advice given to the implementer. The word "should" is used to indicate that the advice is a recommendation, not a requirement. It is implementation defined whether or not a given recommendation is obeyed.
    

    NOTES
    

15. (1) Notes emphasize consequences of the rules described in the (sub)clause or elsewhere. This material is informative.
    Examples
    
16. Examples illustrate the possible forms of the constructs described. This material is informative.

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