gml:ConversionToPreferredUnitType 

The inherited attribute uom references the preferred unit that this conversion applies to. The conversion of a unit to the preferred unit for this physical quantity type is specified by an arithmetic conversion (scaling and/or offset). The content model extends gml:UnitOfMeasureType, which has a mandatory attribute uom which identifies the preferred unit for the physical quantity type that this conversion applies to. The conversion is specified by a choice of 
-	gml:factor, which defines the scale factor, or
-	gml:formula, which defines a formula 
by which a value using the conventional unit of measure can be converted to obtain the corresponding value using the preferred unit of measure.  
The formula defines the parameters of a simple formula by which a value using the conventional unit of measure can be converted to the corresponding value using the preferred unit of measure. The formula element contains elements a, b, c and d, whose values use the XML Schema type double. These values are used in the formula y = (a + bx) / (c + dx), where x is a value using this unit, and y is the corresponding value using the base unit. The elements a and d are optional, and if values are not provided, those parameters are considered to be zero. If values are not provided for both a and d, the formula is equivalent to a fraction with numerator and denominator parameters.

Complex Type Information

Model

gml:factor | gml:formula
Children: gml:factor, gml:formula

Attributes

QName Type Fixed Default Use Inheritable Annotation
uom gml:UomIdentifier required

Used By

Elements gml:conversionToPreferredUnit, gml:roughConversionToPreferredUnit

Source 

<complexType name="ConversionToPreferredUnitType">
  <annotation>
    <documentation>The inherited attribute uom references the preferred unit that this conversion applies to. The conversion of a unit to the preferred unit for this physical quantity type is specified by an arithmetic conversion (scaling and/or offset). The content model extends gml:UnitOfMeasureType, which has a mandatory attribute uom which identifies the preferred unit for the physical quantity type that this conversion applies to. The conversion is specified by a choice of - gml:factor, which defines the scale factor, or - gml:formula, which defines a formula by which a value using the conventional unit of measure can be converted to obtain the corresponding value using the preferred unit of measure. The formula defines the parameters of a simple formula by which a value using the conventional unit of measure can be converted to the corresponding value using the preferred unit of measure. The formula element contains elements a, b, c and d, whose values use the XML Schema type double. These values are used in the formula y = (a + bx) / (c + dx), where x is a value using this unit, and y is the corresponding value using the base unit. The elements a and d are optional, and if values are not provided, those parameters are considered to be zero. If values are not provided for both a and d, the formula is equivalent to a fraction with numerator and denominator parameters.</documentation>
  </annotation>
  <complexContent>
    <extension base="gml:UnitOfMeasureType">
      <choice>
        <element name="factor" type="double"/>
        <element name="formula" type="gml:FormulaType"/>
      </choice>
    </extension>
  </complexContent>
</complexType>