70 lines
2.0 KiB
TeX
70 lines
2.0 KiB
TeX
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% Data classifications
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\label{s:dataclass}
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\index{classification|(}
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\chapter{Common Classifications}
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\label{s:dataclass:common}
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% applies until first subsection
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\sectiondept{it}
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\incomplete
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A classification---also known as a ``class'', but that term is avoided in this
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specification due to ambiguities---is a set of rules performed on the ^[input
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data] yielding a boolean result of the same depth as the largest depth of the
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applicable ^[input data]. \todo{Include formal documentation from DSL manual.}
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\begin{ex}
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Consider a classification~$c$ that has the following rules:
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\begin{itemize}
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\item $5\leq\alpha\leq10$
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\item $\beta>0$
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\end{itemize}
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Given various sets of ^[input data], we would expect the results shown in
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\fref{class-ex}.
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\end{ex}
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\begin{figure}
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\center
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\begin{tabular}{cc|c}
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$\alpha$ & $\beta$ & Result \\
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\hline
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1 & 2 & $\bot$ \\
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5 & 2 & $\top$ \\
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\set{4,5} & \set{10,10} & \set{\bot,\top} \\
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\set{\set{4,5},\set{5,6}} & \set{10,0}
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& \set{\set{\bot,\top},\set{\bot,\bot}} \\
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\end{tabular}
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\caption{Results of various input data some classification}
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\label{f:class-ex}
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\end{figure}
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A classification may treat the result of another classification as ^[input
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data].
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A classification may treat the result of a~^[calculation] (see \sref{premcalc}) as
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^[input data].
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All classifications in this section \shall apply to the ^[input data] as defined
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in~\sref{indata}.
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Each classification \shall have an associated character string
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\dfn{classification!description} which \shall be made accessible to the caller
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as ^[output data] in an \unspecified\ manner.
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The point at which classifications are calculated is \unspecified; an
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implementation \may choose to defer any specific classification until such a
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time that it is needed by a calculation. Furthermore, an implementation \may
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choose not to perform a given classification at all, so long as it is determined
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that such a classification does not apply to any ^[input data].
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%% user content
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\dataclassout
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\index{classification|)}
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