<enumeration>
The
enumeration
facet limits a simple type to a set of distinct values. For example, we can use theenumeration
facet to define a new simple type calledUSState
, derived fromstring
, whose value must be one of the standard US state abbreviations:
<xsd:simpleType name="USState">
<xsd:restriction base="xsd:string">
<xsd:enumeration value="AK"/>
<xsd:enumeration value="AL"/>
<xsd:enumeration value="AR"/>
<!-- and so on ... -->
</xsd:restriction>
</xsd:simpleType>
We can use case objects to express these restrictions. Here's what scalaxb generates:
trait USState object USState { def fromXML(seq: scala.xml.NodeSeq): USState = fromString(seq.text) def fromString(value: String): USState = value match { case "AK" => AK case "AL" => AL case "AR" => AR case "DE" => DE } } case object AK extends USState { override def toString = "AK" } case object AL extends USState { override def toString = "AL" } case object AR extends USState { override def toString = "AR" }