<xsd:element name="valence_ref" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:all>
<xsd:element name="reference" minOccurs="0" maxOccurs="1" nillable="true" type="xsd:string">
<xsd:annotation>
<xsd:documentation xml:lang="en">Literature reference from which the valence parameters identified by attribute id in category valence_param were taken.</xsd:documentation>
</xsd:annotation>
</xsd:element>
</xsd:all>
<xsd:attribute name="id" use="required" type="xsd:string">
<xsd:annotation>
<xsd:documentation xml:lang="en">An identifier for items in this category. Parent of attribute ref_id in category valence_param, which must have the same value.</xsd:documentation>
</xsd:annotation>
</xsd:attribute>
</xsd:complexType>
</xsd:element> |