A constructor of a block object of type
a list of key value pairs, the key is a list of
In the pandoc API http://johnmacfarlane.net/BayHac2014/doc/pandoc-types/Text-Pandoc-Definition.html
DefinitionList is described as follows, each list item is a pair consisting of a term
(a list of
"inline" objects) and one or more definitions (each a list of blocks).
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