src/org/apache/xerces/impl/XMLNamespaceBinder.java [741:806]:
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                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                               "EmptyPrefixedAttName",
                                               new Object[]{attributes.getQName(i)},
                                               XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    continue;
                }

                // declare prefix in context
                fNamespaceContext.declarePrefix(prefix, uri.length() != 0 ? uri : null);

            }
        }

        // bind the element
        String prefix = element.prefix != null
                      ? element.prefix : XMLSymbols.EMPTY_STRING;
        element.uri = fNamespaceContext.getURI(prefix);
        if (element.prefix == null && element.uri != null) {
            element.prefix = XMLSymbols.EMPTY_STRING;
        }
        if (element.prefix != null && element.uri == null) {
            fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                       "ElementPrefixUnbound",
                                       new Object[]{element.prefix, element.rawname},
                                       XMLErrorReporter.SEVERITY_FATAL_ERROR);
        }

        // bind the attributes
        for (int i = 0; i < length; i++) {
            attributes.getName(i, fAttributeQName);
            String aprefix = fAttributeQName.prefix != null
                           ? fAttributeQName.prefix : XMLSymbols.EMPTY_STRING;
            String arawname = fAttributeQName.rawname;
            if (arawname == XMLSymbols.PREFIX_XMLNS) {
                fAttributeQName.uri = fNamespaceContext.getURI(XMLSymbols.PREFIX_XMLNS);
                attributes.setName(i, fAttributeQName);
            }
            else if (aprefix != XMLSymbols.EMPTY_STRING) {
                fAttributeQName.uri = fNamespaceContext.getURI(aprefix);
                if (fAttributeQName.uri == null) {
                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                               "AttributePrefixUnbound",
                                               new Object[]{element.rawname,arawname,aprefix},
                                               XMLErrorReporter.SEVERITY_FATAL_ERROR);
                }
                attributes.setName(i, fAttributeQName);
            }
        }

        // verify that duplicate attributes don't exist
        // Example: <foo xmlns:a='NS' xmlns:b='NS' a:attr='v1' b:attr='v2'/>
        int attrCount = attributes.getLength();
        for (int i = 0; i < attrCount - 1; i++) {
            String auri = attributes.getURI(i);
            if (auri == null || auri == NamespaceContext.XMLNS_URI) {
                continue;
            }
            String alocalpart = attributes.getLocalName(i);
            for (int j = i + 1; j < attrCount; j++) {
                String blocalpart = attributes.getLocalName(j);
                String buri = attributes.getURI(j);
                if (alocalpart == blocalpart && auri == buri) {
                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                               "AttributeNSNotUnique",
                                               new Object[]{element.rawname,alocalpart, auri},
                                               XMLErrorReporter.SEVERITY_FATAL_ERROR);
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src/org/apache/xerces/impl/dtd/XMLNSDTDValidator.java [134:198]:
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                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                               "EmptyPrefixedAttName",
                                               new Object[]{attributes.getQName(i)},
                                               XMLErrorReporter.SEVERITY_FATAL_ERROR);
                    continue;
                }

                // declare prefix in context
                fNamespaceContext.declarePrefix(prefix, uri.length() != 0 ? uri : null);
            }
        }

        // bind the element
        String prefix = element.prefix != null
                      ? element.prefix : XMLSymbols.EMPTY_STRING;
        element.uri = fNamespaceContext.getURI(prefix);
        if (element.prefix == null && element.uri != null) {
            element.prefix = XMLSymbols.EMPTY_STRING;
        }
        if (element.prefix != null && element.uri == null) {
            fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                       "ElementPrefixUnbound",
                                       new Object[]{element.prefix, element.rawname},
                                       XMLErrorReporter.SEVERITY_FATAL_ERROR);
        }

        // bind the attributes
        for (int i = 0; i < length; i++) {
            attributes.getName(i, fAttributeQName);
            String aprefix = fAttributeQName.prefix != null
                           ? fAttributeQName.prefix : XMLSymbols.EMPTY_STRING;
            String arawname = fAttributeQName.rawname;
            if (arawname == XMLSymbols.PREFIX_XMLNS) {
                fAttributeQName.uri = fNamespaceContext.getURI(XMLSymbols.PREFIX_XMLNS);
                attributes.setName(i, fAttributeQName);
            }
            else if (aprefix != XMLSymbols.EMPTY_STRING) {
                fAttributeQName.uri = fNamespaceContext.getURI(aprefix);
                if (fAttributeQName.uri == null) {
                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                               "AttributePrefixUnbound",
                                               new Object[]{element.rawname,arawname,aprefix},
                                               XMLErrorReporter.SEVERITY_FATAL_ERROR);
                }
                attributes.setName(i, fAttributeQName);
            }
        }

        // verify that duplicate attributes don't exist
        // Example: <foo xmlns:a='NS' xmlns:b='NS' a:attr='v1' b:attr='v2'/>
        int attrCount = attributes.getLength();
        for (int i = 0; i < attrCount - 1; i++) {
            String auri = attributes.getURI(i);
            if (auri == null || auri == NamespaceContext.XMLNS_URI) {
                continue;
            }
            String alocalpart = attributes.getLocalName(i);
            for (int j = i + 1; j < attrCount; j++) {
                String blocalpart = attributes.getLocalName(j);
                String buri = attributes.getURI(j);
                if (alocalpart == blocalpart && auri == buri) {
                    fErrorReporter.reportError(XMLMessageFormatter.XMLNS_DOMAIN,
                                               "AttributeNSNotUnique",
                                               new Object[]{element.rawname,alocalpart, auri},
                                               XMLErrorReporter.SEVERITY_FATAL_ERROR);
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