batik-dom/src/main/java/org/apache/batik/dom/ExtensibleDOMImplementation.java [221:242]:
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    public DocumentType createDocumentType(String qualifiedName,
                                           String publicId,
                                           String systemId) {

        if (qualifiedName == null) {
            qualifiedName = "";
        }
        int test = XMLUtilities.testXMLQName(qualifiedName);
        if ((test & XMLUtilities.IS_XML_10_NAME) == 0) {
            throw new DOMException
                (DOMException.INVALID_CHARACTER_ERR,
                 formatMessage("xml.name",
                               new Object[] { qualifiedName }));
        }
        if ((test & XMLUtilities.IS_XML_10_QNAME) == 0) {
            throw new DOMException
                (DOMException.INVALID_CHARACTER_ERR,
                 formatMessage("invalid.qname",
                               new Object[] { qualifiedName }));
        }
        return new GenericDocumentType(qualifiedName, publicId, systemId);
    }
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batik-dom/src/main/java/org/apache/batik/dom/GenericDOMImplementation.java [74:95]:
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    public DocumentType createDocumentType(String qualifiedName,
                                           String publicId,
                                           String systemId) {

        if (qualifiedName == null) {
            qualifiedName = "";
        }
        int test = XMLUtilities.testXMLQName(qualifiedName);
        if ((test & XMLUtilities.IS_XML_10_NAME) == 0) {
            throw new DOMException
                (DOMException.INVALID_CHARACTER_ERR,
                 formatMessage("xml.name",
                               new Object[] { qualifiedName }));
        }
        if ((test & XMLUtilities.IS_XML_10_QNAME) == 0) {
            throw new DOMException
                (DOMException.INVALID_CHARACTER_ERR,
                 formatMessage("invalid.qname",
                               new Object[] { qualifiedName }));
        }
        return new GenericDocumentType(qualifiedName, publicId, systemId);
    }
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