check syntactically for a valid compound unit
A Maple expression is syntactically valid as a compound unit if it is a product of rational powers of syntactically valid unit names, possibly further multiplied by a constant.
The type(expr, syntactically_valid_compound_unit) function returns true if expr has the form of a syntactically valid compound unit. Otherwise, false is returned.
This type exists mostly for use by the Units package internally; if you are considering using this in your program to test something related to user functionality, then it is almost certainly not what you want. Consider instead using the type with_unit to find expressions with units attached, or specfunc(Units:-Unit) to find Unit function calls.
The type tests only whether expr would be valid as a compound unit, not whether it is actually a unit that Maple knows about. For example, not_an_actual_unit would be a valid unit name (and by extension a valid compound unit), so this type returns true. However, it is not an actual unit that is defined in the Maple library.
The expression for a distance of 2 meters plus 3 feet would not be valid as a compound unit.
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