<xsd:element name="expression" id="el.expression">
<xsd:annotation>
<xsd:documentation>
<h:div class="summary" xmlns:h="http://www.w3.org/1999/xhtml">An expression that can be evaluated.</h:div>
<h:div class="description" xmlns:h="http://www.w3.org/1999/xhtml">Experimental. This is essentially a mathematical function, expressed currently in reverse Polish notation but we expect to move to MathML.</h:div>
<h:div class="example" href="potential1.xml" xmlns:h="http://www.w3.org/1999/xhtml" />
</xsd:documentation>
</xsd:annotation>
<xsd:complexType>
<xsd:sequence>
<xsd:choice minOccurs="0" maxOccurs="unbounded">
<xsd:element ref="parameter" />
<xsd:element ref="operator" />
</xsd:choice>
</xsd:sequence>
<xsd:attributeGroup ref="title" />
<xsd:attributeGroup ref="id" />
<xsd:attributeGroup ref="convention" />
<xsd:attributeGroup ref="dictRef" />
<xsd:attributeGroup ref="dataType" />
</xsd:complexType>
</xsd:element>
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