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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 validate_tag(self, key, value):
 """Check whether a tag value is valid Args: key: A tag key value: A tag value Returns: `(True or False)` A boolean indicating whether or not the value is valid """

        if key == 'owner':
            return validate_email(value, self.partial_owner_match)
        elif key == self.gdpr_tag:
            return value in self.gdpr_tag_values
        else:
            return True