E.5.2:1 - Problem frame

Use this pattern when expressing FPF content or using another expression to carry that content. Keep the conceptual meaning recoverable while choosing an expression that supports the intended work. A diagram, calculus or sequence of learned signs may help a reader reason or construct a result. A single expression needs an explanation of its interpretation; a semantic mapping is needed when expressions are compared or one is translated, substituted or relied on as carrying the other’s content.

A representation scheme supplies conventions for forming and interpreting expressions. A particular table, drawing, formula or vocal phrase is an expression read under those conventions.

FPF concepts must travel across disciplines, tools and future notations. If their meaning can only be recovered from one diagram style, file syntax or markup dialect, other users must reconstruct it before they can apply the pattern.