Hi, the following should be an equation with fraction. typesetting it (mkii), there are now fractions what's wrong? [apologies, my first mathml test] \starttext \startXMLdata <formula> <math display='block'> <semantics> <mrow> <mfrac> <mrow> <mover> <mi>A</mi> <mo>•</mo> </mover> </mrow> <mi>A</mi> </mfrac> <mo>=</mo><mi>Φ</mi><mo stretchy='false'>(</mo><mi>H<mo stretchy='false'>)</mo><mo>⋅</mo><mrow><mo>[</mo> <mrow> <mfrac> <mrow> <mi>T</mi><mo stretchy='false'>(</mo><mi>t</mi><mo stretchy='false'>)</mo><mo>−</mo><mi>A</mi><mo stretchy='false'>(</mo><mi>t</mi><mo stretchy='false'>)</mo> </mrow> <mrow> <mi>A</mi><mo stretchy='false'>(</mo><mi>t</mi><mo stretchy='false'>)</mo> </mrow> </mfrac> </mrow> <mo>]</mo></mrow> </mrow> <annotation encoding='MathType-MTEF'> </annotation> </semantics> </math> </formula> \stopXMLdata \stoptext ======= steffen