<complexType name="AmountOfSubstancePerAreaMeasureType">
<annotation>
<documentation>Surface concentration: Molar quantity per unit area. Used in surface chemistry, adsorption studies, and catalysis. Common units include mol/m² and lbmol/ft².</documentation>
</annotation>
<simpleContent>
<extension base="diggs:DescriptorValueType">
<attribute name="uom" type="diggs:AmountOfSubstancePerAreaUomEnumType">
<annotation>
<documentation>The unit of measure for surface concentration.</documentation>
</annotation>
</attribute>
</extension>
</simpleContent>
</complexType>
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