fixes import on a typical schema-org.json #265
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this adds methods get_first and get_all to get elm or get list
and fixes some parse errors
schema.org has a 0-N cardinality for most of its properties, if the value is single, the actual value is returned, if it is multiple a list of elements is returned
These utility functions provide option to grab the first or all elements, while checking their type to be literal or list, get-all returns list, get-first returns literal
some samples:
either fetch the json-ld from the html or open it in https://validator.schema.org/