Printable

All objects that can be represented as a string are Printable. This is basically the case of all calculus objects, like Equation, Table or Item etc.

Fields	Methods (provided)	Methods (must be reimplemented)
		into_str()

into_str() 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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