<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
        xmlns:thing-description="https://openhab.org/schemas/thing-description/v1.0.0"
        xmlns:config-description="https://openhab.org/schemas/config-description/v1.0.0"
        targetNamespace="https://openhab.org/schemas/thing-description/v1.0.0">

    <xs:import namespace="https://openhab.org/schemas/config-description/v1.0.0"
            schemaLocation="https://openhab.org/schemas/config-description-1.0.0.xsd"/>

    <xs:element name="thing-descriptions">
        <xs:complexType>
            <xs:choice minOccurs="1" maxOccurs="unbounded">
                <xs:element name="thing-type" type="thing-description:thingType"/>
                <xs:element name="bridge-type" type="thing-description:bridgeType"/>
                <xs:element name="channel-type" type="thing-description:channelType"/>
                <xs:element name="channel-group-type" type="thing-description:channelGroupType"/>
            </xs:choice>
            <xs:attribute name="bindingId" type="config-description:idRestrictionPattern" use="required"/>
        </xs:complexType>
    </xs:element>

    <xs:complexType name="thingType">
        <xs:sequence>
            <xs:element name="supported-bridge-type-refs" type="thing-description:supportedBridgeTypeRefs" minOccurs="0"/>
            <xs:element name="label" type="xs:string"/>
            <xs:element name="description" type="xs:string" minOccurs="0"/>
            <xs:element name="category" type="xs:string" minOccurs="0"/>
            <xs:choice minOccurs="0">
                <xs:element name="channels" type="thing-description:channels"/>
                <xs:element name="channel-groups" type="thing-description:channelGroups"/>
            </xs:choice>
            <xs:element name="properties" type="thing-description:properties" minOccurs="0"/>
            <xs:element name="representation-property" type="xs:string" minOccurs="0"/>
            <xs:choice minOccurs="0">
                <xs:element name="config-description" type="config-description:configDescription"/>
                <xs:element name="config-description-ref" type="config-description:configDescriptionRef"/>
            </xs:choice>
        </xs:sequence>
        <xs:attribute name="id" type="config-description:idRestrictionPattern" use="required"/>
        <xs:attribute name="listed" type="xs:boolean" default="true" use="optional"/>
        <xs:attribute name="extensible" type="thing-description:namespaceIdListRestrictionPattern" use="optional"/>
    </xs:complexType>
    
    <xs:simpleType name="namespaceIdListRestrictionPattern">
        <xs:restriction base="xs:string">
            <xs:pattern value="[A-Za-z0-9\-_.]+(,( )?[A-Za-z0-9\-_.]+)*" />
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="bridgeType">
        <xs:complexContent>
            <xs:extension base="thing-description:thingType"/>
        </xs:complexContent>
    </xs:complexType>

    <xs:simpleType name="auto-update-policy">
        <xs:restriction base="xs:string">
            <xs:enumeration value="veto" />
            <xs:enumeration value="default" />
            <xs:enumeration value="recommend" />
        </xs:restriction>
    </xs:simpleType>    

    <xs:complexType name="channelType">
        <xs:sequence>
            <xs:element name="item-type" type="xs:string" minOccurs="0"/>
            <xs:element name="kind" type="xs:string" minOccurs="0"/>
            <xs:element name="label" type="xs:string"/>
            <xs:element name="description" type="xs:string" minOccurs="0"/>
            <xs:element name="category" type="xs:string" minOccurs="0"/>
            <xs:element name="tags" type="thing-description:tags" minOccurs="0"/>
            <xs:element name="state" type="thing-description:state" minOccurs="0"/>
            <xs:element name="command" type="thing-description:command" minOccurs="0"/>
            <xs:element name="event" type="thing-description:event" minOccurs="0"/>
            <xs:element name="autoUpdatePolicy" type="thing-description:auto-update-policy" minOccurs="0"/>
            <xs:choice minOccurs="0">
                <xs:element name="config-description" type="config-description:configDescription"/>
                <xs:element name="config-description-ref" type="config-description:configDescriptionRef"/>
            </xs:choice>
        </xs:sequence>
        <xs:attribute name="id" type="config-description:idRestrictionPattern" use="required"/>
        <xs:attribute name="advanced" type="xs:boolean" default="false" use="optional"/>
        <xs:attribute name="system" type="xs:boolean" default="false" use="optional"/>
    </xs:complexType>

    <xs:complexType name="channelGroupType">
        <xs:sequence>
            <xs:element name="label" type="xs:string"/>
            <xs:element name="description" type="xs:string" minOccurs="0"/>
            <xs:element name="category" type="xs:string" minOccurs="0"/>
            <xs:element name="channels" type="thing-description:channels" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="id" type="config-description:idRestrictionPattern" use="required"/>
    </xs:complexType>

    <xs:complexType name="supportedBridgeTypeRefs">
        <xs:sequence>
            <xs:element name="bridge-type-ref" type="thing-description:bridgeTypeRef" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="bridgeTypeRef">
        <xs:attribute name="id" type="config-description:idRestrictionPattern" use="required"/>
    </xs:complexType>

    <xs:complexType name="channels">
        <xs:sequence>
            <xs:element name="channel" type="thing-description:channel" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:simpleType name="namespaceIdRestrictionPattern">
        <xs:restriction base="xs:string">
            <xs:pattern value="[A-Za-z0-9\-_.]+" />
        </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="channel">
        <xs:sequence>
            <xs:element name="label" type="xs:string" minOccurs="0"/>
            <xs:element name="description" type="xs:string" minOccurs="0"/>
            <xs:element name="properties" type="thing-description:properties" minOccurs="0"/>
            <xs:element name="autoUpdatePolicy" type="thing-description:auto-update-policy" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="id" type="config-description:idRestrictionPattern" use="required"/>
        <xs:attribute name="typeId" type="thing-description:namespaceIdRestrictionPattern" use="required"/>
    </xs:complexType>

    <xs:complexType name="channelGroups">
        <xs:sequence>
            <xs:element name="channel-group" type="thing-description:channelGroup" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="channelGroup">
        <xs:sequence>
            <xs:element name="label" type="xs:string" minOccurs="0"/>
            <xs:element name="description" type="xs:string" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="id" type="config-description:idRestrictionPattern" use="required"/>
        <xs:attribute name="typeId" type="config-description:idRestrictionPattern" use="required"/>
    </xs:complexType>

    <xs:complexType name="tags">
        <xs:sequence>
            <xs:element name="tag" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="state">
        <xs:sequence>
            <xs:element name="options" type="thing-description:options" minOccurs="0"/>
        </xs:sequence>
        <xs:attribute name="min" type="xs:decimal" use="optional"/>
        <xs:attribute name="max" type="xs:decimal" use="optional"/>
        <xs:attribute name="step" type="xs:decimal" use="optional"/>
        <xs:attribute name="pattern" type="xs:string" use="optional"/>
        <xs:attribute name="readOnly" type="xs:boolean" default="false" use="optional"/>
    </xs:complexType>

    <xs:complexType name="event">
        <xs:sequence>
            <xs:element name="options" type="thing-description:options" minOccurs="0"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="options">
        <xs:sequence>
            <xs:element name="option" type="thing-description:option" minOccurs="1" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="command">
        <xs:sequence>
            <xs:element name="options" type="thing-description:options" minOccurs="0"/>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="option">
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="value" type="xs:string" use="required"/>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>

	<xs:complexType name="properties">
		<xs:sequence>
			<xs:element name="property" type="thing-description:property" minOccurs="1" maxOccurs="unbounded" />
		</xs:sequence>
	</xs:complexType>

	<xs:complexType name="property">
		<xs:simpleContent>
			<xs:extension base="xs:string">
				<xs:attribute name="name" type="xs:string" use="required" />
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>

	<xs:simpleType name="dimension">
		<xs:restriction base="xs:string">
			<xs:enumeration value="Intensity" />
			<xs:enumeration value="Acceleration" />
			<xs:enumeration value="AmountOfSubstance" />
			<xs:enumeration value="Angle" />
			<xs:enumeration value="AngularAcceleration" />
			<xs:enumeration value="AngularVelocity" />
			<xs:enumeration value="Area" />
			<xs:enumeration value="CatalyticActivity" />
			<xs:enumeration value="DataAmount" />
			<xs:enumeration value="DataRate" />
			<xs:enumeration value="Dimensionless" />
			<xs:enumeration value="Duration" />
			<xs:enumeration value="DynamicViscosity" />
			<xs:enumeration value="ElectricCapacitance" />
			<xs:enumeration value="ElectricCharge" />
			<xs:enumeration value="ElectricConductance" />
			<xs:enumeration value="ElectricCurrent" />
			<xs:enumeration value="ElectricInductance" />
			<xs:enumeration value="ElectricPotential" />
			<xs:enumeration value="ElectricResistance" />
			<xs:enumeration value="Energy" />
			<xs:enumeration value="Force" />
			<xs:enumeration value="Frequency" />
			<xs:enumeration value="Illuminance" />
			<xs:enumeration value="KinematicViscosity" />
			<xs:enumeration value="Length" />
			<xs:enumeration value="LuminousFlux" />
			<xs:enumeration value="LuminousIntensity" />
			<xs:enumeration value="MagneticFlux" />
			<xs:enumeration value="MagneticFluxDensity" />
			<xs:enumeration value="Mass" />
			<xs:enumeration value="MassFlowRate" />
			<xs:enumeration value="Power" />
			<xs:enumeration value="Pressure" />
			<xs:enumeration value="RadiationDoseAbsorbed" />
			<xs:enumeration value="RadiationDoseEffective" />
			<xs:enumeration value="RadioactiveActivity" />
			<xs:enumeration value="SolidAngle" />
			<xs:enumeration value="Speed" />
			<xs:enumeration value="Temperature" />
			<xs:enumeration value="Torque" />
			<xs:enumeration value="Velocity" />
			<xs:enumeration value="Time" />
			<xs:enumeration value="Volume" />
			<xs:enumeration value="VolumetricDensity" />
			<xs:enumeration value="VolumetricFlowRate" />
		</xs:restriction>
	</xs:simpleType>
	
</xs:schema>
