<xsd:element name="oMath" type="CT_OMath" minOccurs="1" maxOccurs="unbounded"> <xsd:annotation> <xsd:documentation>Office Math</xsd:documentation> </xsd:annotation> <xsd:unique name="uniqueContentAnchorIdsInsideMath"> <xsd:selector xpath="m:annotation/m:content" /> <xsd:field xpath="@id" /> </xsd:unique> <xsd:unique name="uniqueContextAnchorIdsInsideMath"> <xsd:selector xpath="m:annotation/m:context" /> <xsd:field xpath="@id" /> </xsd:unique> </xsd:element>