%7E: The namespace "http://example.com/%7E" in the stylesheet matches the namespace "http://example.com/%7E" in the document. %7E: The namespace "http://example.com/%7E" in the stylesheet matches the namespace "http://example.com/%7E" in the document again. %7e: The namespace "http://example.com/%7E" in the stylesheet matches the namespace "http://example.com/%7e" in the document. ~: The namespace "http://example.com/%7E" in the stylesheet matches the namespace "http://example.com/~" in the document.