simpleType  thickness 
versionV3_1
namespacehttp://www.w3.org/1998/Math/MathML
typerestriction of xsd:string
used by
attribute {}:mfrac.attlist/@linethickness  {}:mstyle.attlist/@linethickness
source<xsd:simpleType  name="thickness">
<xsd:restriction  base="xs:string">
<xsd:enumeration  value="thin">
</xsd:enumeration> <xsd:enumeration  value="medium">
</xsd:enumeration> <xsd:enumeration  value="thick">
</xsd:enumeration>
</xsd:restriction>
</xsd:simpleType>