<grammar xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns="http://relaxng.org/ns/structure/1.0" ns="http://www.w3.org/1998/Math/MathML"> <include href="mathml3-content.rng"> <a:documentation>Content MathML</a:documentation> </include> <include href="mathml3-presentation.rng"> <a:documentation>Presentation MathML</a:documentation> </include> <include href="mathml3-common.rng"> <a:documentation>math and semantics common to both Content and Presentation</a:documentation> </include> </grammar>