def content_type(self):
        """
        Get the CoRE Link Format ct attribute of the resource.

        :return: the CoRE Link Format ct attribute
        """
        value = ""
        lst = self._attributes.get("ct")
        if lst is not None and len(lst) > 0:
            value = "ct="
            for v in lst:
                value += str(v) + " "
        if len(value) > 0:
            value = value[:-1]
        return value
Get the CoRE Link Format ct attribute of the resource.

        :return: the CoRE Link Format ct attribute