The Math command simply returns a record detailing properties of the given expression. A significant property is called "math", and can be accessed via the colon-dash syntax.
The ShowCanvas command respects some of the properties, such as annotation and position:
Some tricks can be used to format the math, such as using InertForm to prevent automatic simplification. Here Typesetting:-mspace() is also used to create a blank:
Incomplete expressions that cannot be represented as a Maple data structure can be written directly in MathML. Here is an example that leaves the numerator of a fraction blank.
Here are some other options, of which some of these control behavior that may only apply to the Maple Learn environment.
When fetching a canvas from Maple Learn, the GetMath command calls Math(...) to create record structures.