<grammar xmlns="http://relaxng.org/ns/structure/1.0" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"> <include href="mod/smilref-attr.rng"/> <include href="http://www.daisy.org/pipeline/modules/mathml-utils/mathml3.rng" ns="http://www.w3.org/1998/Math/MathML"> <start combine="choice"> <notAllowed/> </start> <define name="math.id.type"> <data type="NCName"/> </define> </include> <include href="dtbook/dtbook-2005-3.rng" ns="http://www.daisy.org/z3986/2005/dtbook/"> <define name="dtb.id.type"> <data type="NCName"/> </define> <define name="dtb.idrefs.type"> <list> <oneOrMore> <data type="NCName"/> </oneOrMore> </list> </define> <define name="dtb.externalFlow" combine="choice" ns="http://www.daisy.org/z3986/2005/dtbook/"> <ref name="math" ns="http://www.w3.org/1998/Math/MathML"/> </define> </include> </grammar>