Make sure that isSupportedMathMLElement() checks that the element is in the MathML namespace.
Make sure that isSupportedMathMLElement() checks that the element is in the MathML namespace.

MichaelClerx/libcellml,MichaelClerx/libcellml,hsorby/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,cellml/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,cellml/libcellml,MichaelClerx/libcellml,nickerso/libcellml