def is_link(value):
return (<EOL>isinstance(value, dict) and<EOL>value.get('<STR_LIT>', {}).get('<STR_LIT:type>', '<STR_LIT>') == '<STR_LIT>'<EOL>)<EOL>
Checks if value is link or not.

    :param value: any object.
    :return: Boolean
    :rtype: bool

    Usage:
        >>> is_link('foo')
        False
        >>> is_link({'sys': {'type': 'Link', 'id': 'foobar'}})
        True