Keys and Comments

Querying keys

All elements have a key (list items return the key of the list) therefore you don't need to specify optional/required here:

>>> document.elements()[0].string_key()
>>> document.fieldset('image').entries()[0].string_key()

Querying comments

All elements can have an associated comment and like with values you specify whether it's optional or required:

>>> document.field('author').required_string_comment()
>>> document.fieldset('image').optional_string_comment()

Next page: Predefined Types