def METHOD_NAME(self, data):
    schema = data.get('schema').lower()
    value = data.get('value')
    url_prefix = self.schema_to_url_link_prefix_map.get(schema)
    if url_prefix is None:
        return missing
    if schema == 'kekscan':
        kekscan_link = self.get_link_for_kekscan_schema(value)
        if kekscan_link is None:
            return missing
        return kekscan_link
    return '{}{}'.format(url_prefix, value)