(PHP 5 >= 5.1.0, PHP 7, PHP 8)
XMLReader::setRelaxNGSchema — Set the filename or URI for a RelaxNG Schema
public XMLReader::setRelaxNGSchema(?string $filename): bool
Set the filename or URI for the RelaxNG Schema to use for validation.
filenamefilename or URI pointing to a RelaxNG Schema.
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https://www.php.net/manual/en/xmlreader.setrelaxngschema.php