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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def cds_identifier_validator(record, result):
 """Ensure that the two records have the same CDS identifier. This is needed because the search is done only for ``external_system_identifiers.value``, which might cause false positives in case the matched record has an identifier with the same ``value`` but ``schema`` different from CDS. Args: record (dict):
 the given record we are trying to match with similar ones in INSPIRE. result (dict):
 possible match returned by the ES query that needs to be validated. Returns: bool: validation decision. """


    record_external_identifiers = get_value(record, 'external_system_identifiers', [])
    result_external_identifiers = get_value(result, '_source.external_system_identifiers', [])

    record_external_identifiers = {external_id["value"] for external_id in record_external_identifiers if external_id["schema"] == 'CDS'}
    result_external_identifiers = {external_id["value"] for external_id in result_external_identifiers if external_id["schema"] == 'CDS'}

    return bool(record_external_identifiers & result_external_identifiers)