<xs:simpleType name="ReferenceCondition"><xs:annotation><xs:documentation>Combinations of standard temperature and pressure including "ambient". The list of standard values is contained in the enumValuesProdml.xml file.</xs:documentation></xs:annotation><xs:restriction base="eml:TypeEnum"><xs:enumeration value="0 degC 1 atm"><xs:annotation><xs:documentation>0 degC and 1 standard atmosphere</xs:documentation></xs:annotation></xs:enumeration><xs:enumeration value="0 degC 1 bar"/><xs:enumeration value="15 degC 1 atm"><xs:annotation><xs:documentation>15 degC and 1 standard atmosphere</xs:documentation></xs:annotation></xs:enumeration><xs:enumeration value="15 degC 1 bar"/><xs:enumeration value="20 degC 1 atm"/><xs:enumeration value="20 degC 1 bar"/><xs:enumeration value="25 degC 1 bar"/><xs:enumeration value="60 degF 1 atm"><xs:annotation><xs:documentation>60 degF and 1 standard atmosphere</xs:documentation></xs:annotation></xs:enumeration><xs:enumeration value="60 degF 30 in Hg"/><xs:enumeration value="ambient"/></xs:restriction></xs:simpleType>