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XSD <?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:simpleType name="MgmtCodetyp"> <xsd:restriction base="xsd:string"> <xsd:pattern value="[A-Z][A-Z]([A-Z]|[0-9])"></xsd:pattern> </xsd:restriction> </xsd:simpleType> <xsd:element name="MgmtCode" type="MgmtCodetyp"></xsd:element> </xsd:schema> XML <MgmtCode>AGF</MgmtCode> PHP Code <?php $file = "data.xml"; function libxml_display_error($error) { $return = "\n"; switch ($error->level) { case LIBXML_ERR_ERROR: $return .= "[ERROR] "; break; case LIBXML_ERR_FATAL: $return .= "[FATAL] "; break; default: $return .= "[uNKNOWN] "; } $return .= trim($error->message); $return .= " [line: $error->line]\n"; return $return; } function libxml_display_errors() { $errors = libxml_get_errors(); foreach ($errors as $error) { if ($error -> level != LIBXML_ERR_WARNING) { print libxml_display_error($error); } } libxml_clear_errors(); } // Enable user error handling libxml_use_internal_errors(true); $xml = new DOMDocument; $xml -> load("kkk.xml"); if (!$xml -> schemaValidate("kkk.xsd")) { libxml_display_errors(); } else { print "no error\n"; } ?> OUTPUT [ERROR] Element 'MgmtCode': [facet 'pattern'] The value 'AGF' is not accepted by the pattern '[A-Z][A-Z]([A-Z]|[0-9])'. [line: 1] [ERROR] Element 'MgmtCode': 'AGF' is not a valid value of the atomic type 'MgmtCodetyp'. [line: 1] ANALYSIS The XML is a perfectly valid xml. I don't understand why it failed the XSD.