tml:timeRelation 

Identifies the absolute time reference for each sysClk.  Default is any time reference in a cluster represents absolute time relating to the corresponding clock value.  An empty timeRelation tag in a data stream indicates that this uidRef relation is no longer a part of the system

Element Information

Model

tml:sysClkUidRef{0,1} , tml:timeReference{0,1} , tml:timeCoordinate*
Children: tml:sysClkUidRef, tml:timeCoordinate, tml:timeReference

Attributes

QName Type Fixed Default Use Inheritable Annotation
name xs:string optional 
short descriptive name of element
uid xs:anyURI optional 
unique ID for this element
uidRef xs:anyURI optional 
the contents of this element are exactly the same as the contents of the uidRef element. no need repeating it. (similar to xlink)

Source 

<xs:element name="timeRelation" minOccurs="0" maxOccurs="unbounded">
  <xs:annotation>
    <xs:documentation>Identifies the absolute time reference for each sysClk. Default is any time reference in a cluster represents absolute time relating to the corresponding clock value. An empty timeRelation tag in a data stream indicates that this uidRef relation is no longer a part of the system</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element name="sysClkUidRef" type="tml:BindType" minOccurs="0">
        <xs:annotation>
          <xs:documentation>UID of the sysClk. Default: Uid of system clock which transducer is contained in.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="timeReference" type="tml:BindType" minOccurs="0">
        <xs:annotation>
          <xs:documentation>time Datum. Allowed Values: UTC, other, Default UTC.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="timeCoordinate" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="timeCoordType" type="tml:BindType" minOccurs="0">
              <xs:annotation>
                <xs:documentation>Allowed values: dateTime, year, mo, day, hour, min, sec. Default: dateTime (ISO 8601)</xs:documentation>
              </xs:annotation>
            </xs:element>
            <xs:element name="absTimeUidRef" type="tml:BindType" minOccurs="0" maxOccurs="unbounded">
              <xs:annotation>
                <xs:documentation>dataUid reference of the sensor measurements providing the absolute time reference.</xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attributeGroup ref="tml:uid_uidRef"/>
  </xs:complexType>
</xs:element>

Sample