Printable

All objects that can be represented as a string are Printable.

This is basically the case of calculus objects, like Equation or Item etc. but not the case of geometric objects, which are Drawable instead.

Method (must be reimplemented) : into_str()

The into_str() method computes the string representation of the object in a markup language (which one is provided in the configuration file).

For instance, if the markup language is LaTeX and the object is a [Fraction] having a plus sign, a numerator being a Product of Item 3 and Item 4 and a denominator being an Item 5, the result of into_str() should be something like \frac{3\times 4}{5}.

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