Data Type - logical

Datatype: logical

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

True, False, or Unknown. This datatype is the same as the boolean datatype, with three case variations of unknown added.

Proposed Usage:

This datatype was developed to support the Epicentre logical data type. Its intended usage is shown in the PEF logical element document. Usage as a useful datatype is shown in the following sample usage schema and sample XML.

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:simpleType name="logical">
  <xsd:restriction base="xsd:string">
    <xsd:enumeration value="true"/>
    <xsd:enumeration value="True"/>
    <xsd:enumeration value="TRUE"/>
    <xsd:enumeration value="false"/>
    <xsd:enumeration value="False"/>
    <xsd:enumeration value="FALSE"/>
    <xsd:enumeration value="unknown"/>
    <xsd:enumeration value="Unknown"/>
    <xsd:enumeration value="UNKNOWN"/>
  </xsd:restriction>
</xsd:simpleType>

Sample Usage Schema:

This datatype implies that the application must be able to accept the various case alternatives of true, false, and unknown.

This datatype alone contains no elements. All namespace requirements will be derived from the schema that includes this file. The following uses unqualified.

   <xsd:element name="someFlag" type="logical"/>

Sample XML:

   <someFlag>True</someFlag>