Data Type - canonicalQuantityType

Datatype: canonicalQuantityType

Found in http://www.posc.org/schemas/useful_types.xsd
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Description:

An element that is defined as a canonicalQuantityType will have the following subelements:

value: The numerical value of the quantity.
Choice of: (see TBD for more information)

UnitDefinition: A structure of type unitMod which is used to define unit of measure.
unitRef: A reference to a unit of measure (uriReference) accessible to the application.

Proposed Usage:

This datatype was developed to test alternative methods of capturing quantities and their units of measure. It is expected that this datatype will change with time.

XML Schema:

The schema and examples do not explicitly show the lines that set the namespaces.

All schema examples will use xsd: as the namespace for the schema tags and datatypes, and null for all the locally generated namespaces.

XML Examples will exclude namespace modifiers for clarity. Actual XML will probably need namespaces.

<xsd:complexType name="canonicalQuantityType">
 <xsd:sequence>
  <xsd:element name="value" type="xsd:double"/>
  <xsd:choice>
   <xsd:element name="UnitDefinition" type="unitMod"/>
   <xsd:element name="unitRef">
    <xsd:complexType>
     <xsd:attribute name="refTo" type="xsd:uriReference" use="required"/>
    </xsd:complexType>
   </xsd:element>
  </xsd:choice>
 </xsd:sequence>
</xsd:complexType>

Sample Usage Schema:

All elements are local. It is recommended that elementFormDefault be "qualified."

   <xsd:element name="firstValue" type="canonicalQuantityType"/>
   <xsd:element name="secondValue" type="canonicalQuantityType"/>

Sample XML:

   <firstValue>
     <value>27762.335</value>
     <unitRef refTo="#m"/>
   </firstValue>
   <secondValue>
     <value>9662.401</value>
     <UnitDefinition uid="ft" symbol="ft">
       <name>International foot</name>
       <ConversionToBaseUnit baseUnit="#m">
         <factor>.3048</factor>
       </ConversionToBaseUnit>
     </UnitDefinition>
   </secondValue>