[External] IEEE Std 990-1987 - IEEE Recommended Practice for Ada as a Program Design Language

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The report provides recommendations reflecting the state of the art and alternative approaches to good practice for characteristics of program design languages (PDLs) based on the syntax and semantics of Ada. The recommended practice addresses the characteristics of an Ada PDL and not the use of an Ada PDL. While it is widely recognized that graphic representations may enhance the design activity, there is no clear consensus concerning graphic representations. As such, this document is principally concerned with aspects of textual representations.