html validator error for:xmlns:v="https://rdf.data-vocabulary.org/#"

  • Hi

    This may have been asked before, but i did not find any thing.

    Line 823 in class-breadcrumbs.php causes an error when validating html:

    $output = '<' . $this->wrapper . $this->get_output_id() . $this->get_output_class() . ' xmlns:v="https://rdf.data-vocabulary.org/#">' . $this->output . '</' . $this->wrapper . '>';

    I removed xmlns:v="https://rdf.data-vocabulary.org/#".
    The error is gone in html validation.

    Since i do not know what this line means, i wonder if it is ok to delete it?
    Is there a better and update safe way to get rid of this error?

    regards
    theo

    https://www.ads-software.com/plugins/wordpress-seo/

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