<xs:element name="createdTimestamp" type="dateTime">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Field containing date and time when this record was created.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="lastModifiedTimestamp" type="dateTime">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Field containing date and time when this records was last updated.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="title" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Title or name of this entity. This should be a 'human readable' name by which the entity is referred.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="identifier">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Identifier for this entity which in combination with the domain should be unique. This is typically a computer generated code such as a database primary key.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute name="domain" use="required">
          <xs:annotation>
            <xs:documentation xml:lang="EN">The domain which this identifier is applicable to. Could be the URL of the organisation's server or the name of the organisation as long as it is not ambiguous.</xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:element>

<xs:element name="comments" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">More information about this entity.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="idRef">
  <xs:complexType>
    <xs:attribute name="ref" type="xs:IDREF"/>
  </xs:complexType>
</xs:element>

<xs:element name="xLink">
  <xs:complexType>
    <xs:attribute ref="xlink:href"/>
  </xs:complexType>
</xs:element>

<series>
  <idRef ref="">{1,1}</idRef>
  <xLink xlink:href="">{1,1}</xLink>
  <identifier domain="">{1,1}</identifier>
</series>

<xs:element name="series" type="seriesLink" minOccurs="0" maxOccurs="unbounded"/>

<preferredSeries>
  <idRef ref="">{1,1}</idRef>
  <xLink xlink:href="">{1,1}</xLink>
  <identifier domain="">{1,1}</identifier>
</preferredSeries>

<xs:element name="preferredSeries" type="seriesLink" minOccurs="0" maxOccurs="1"/>

<xs:element name="type" type="controlledVoc">
  <xs:annotation>
    <xs:documentation xml:lang="EN">The type of entity this is. Preferrably derived from a controlled vocabulary.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="description" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">General description of this entity.</xs:documentation>
  </xs:annotation>
</xs:element>

<location>
  <locationGeometry>{1,1}</locationGeometry>
  <locationType>{0,1}</locationType>
  <locationPrecision>{0,1}</locationPrecision>
  <locationComment>{0,1}</locationComment>
  <address>{0,1}</address>
</location>

<xs:element name="location">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Details about the geographical location of this entity.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="locationGeometry"/>
      <xs:element ref="locationType" minOccurs="0"/>
      <xs:element ref="locationPrecision" minOccurs="0"/>
      <xs:element ref="locationComment" minOccurs="0"/>
      <xs:element ref="address" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<locationGeometry>
  <gml:Point gml:id="" srsName="">{1,1}</gml:Point>
  <gml:Polygon gml:id="" srsName="">{1,1}</gml:Polygon>
</locationGeometry>

<xs:element name="locationGeometry">
  <xs:annotation>
    <xs:documentation xml:lang="EN">GML representation of a location. Can be either a point to represent a particular location or a polygon to represent an area or a geographical extent / bounding box.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:choice>
      <xs:element ref="gml:Point"/>
      <xs:element ref="gml:Polygon"/>
    </xs:choice>
  </xs:complexType>
</xs:element>

<xs:element name="locationType" type="normalTridasLocationType">
  <xs:annotation>
    <xs:documentation xml:lang="EN">The type of location that the geometry field represents taken from the TRiDaS controlled vocabulary.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="locationPrecision" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Stores potential difference; number of meters difference, so 0 is exact.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="locationComment" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Additional information about the location, for example, point taken from center or corner of area, which corner</xs:documentation>
  </xs:annotation>
</xs:element>

<address>
  <addressLine1>{0,1}</addressLine1>
  <addressLine2>{0,1}</addressLine2>
  <cityOrTown>{0,1}</cityOrTown>
  <stateProvinceRegion>{0,1}</stateProvinceRegion>
  <postalCode>{0,1}</postalCode>
  <country>{0,1}</country>
</address>

<xs:element name="address">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Address information about this location</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element name="addressLine1" type="xs:string" minOccurs="0"/>
      <xs:element name="addressLine2" type="xs:string" minOccurs="0"/>
      <xs:element name="cityOrTown" type="xs:string" minOccurs="0"/>
      <xs:element name="stateProvinceRegion" type="xs:string" minOccurs="0"/>
      <xs:element name="postalCode" type="xs:string" minOccurs="0"/>
      <xs:element name="country" type="xs:string" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<xs:element name="addressLine1" type="xs:string" minOccurs="0"/>

<xs:element name="addressLine2" type="xs:string" minOccurs="0"/>

<xs:element name="cityOrTown" type="xs:string" minOccurs="0"/>

<xs:element name="stateProvinceRegion" type="xs:string" minOccurs="0"/>

<xs:element name="postalCode" type="xs:string" minOccurs="0"/>

<xs:element name="country" type="xs:string" minOccurs="0"/>

<xs:element name="file">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Filename of a file associated with this entity.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:attribute ref="xlink:href" use="required"/>
  </xs:complexType>
</xs:element>

<xs:element name="genericField">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Generic field for storing key/value pairs for data not currently supported in the TRiDaS standard</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute name="name" use="required">
          <xs:annotation>
            <xs:documentation>Name of the field.</xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name="type" use="optional">
          <xs:annotation>
            <xs:documentation>The data type that this field contains.</xs:documentation>
          </xs:annotation>
          <xs:simpleType>
            <xs:restriction base="xs:string">
              <xs:enumeration value="xs:string"/>
              <xs:enumeration value="xs:boolean"/>
              <xs:enumeration value="xs:int"/>
              <xs:enumeration value="xs:float"/>
              <xs:enumeration value="xs:date"/>
              <xs:enumeration value="xs:dateTime"/>
              <xs:enumeration value="xs:duration"/>
            </xs:restriction>
          </xs:simpleType>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:element>

<tridas>
  <project>{0,unbounded}</project>
  <vocabulary>{0,1}</vocabulary>
</tridas>

<xs:element name="tridas">
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="project" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element ref="vocabulary" minOccurs="0" maxOccurs="1"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<project>
  <title>{1,1}</title>
  <identifier domain="">{0,1}</identifier>
  <createdTimestamp certainty="">{0,1}</createdTimestamp>
  <lastModifiedTimestamp certainty="">{0,1}</lastModifiedTimestamp>
  <comments>{0,1}</comments>
</project>

<xs:element name="project">
  <xs:annotation>
    <xs:documentation xml:lang="EN">A project is defined by a laboratory and encompasses dendrochronological research of a particular object or group of objects. Examples include: the dating of a building; the research of forest dynamics in a stand of living trees; the dating of all Rembrandt paintings in a museum. What is considered a 'project' is up to the laboratory performing the research. It could be the dating of a group of objects, but the laboratory can also decide to define a separate project for each object. Therefore, a project can have one or more objects associated with it.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="tridasEntity">
        <xs:sequence>
          <xs:element ref="type" maxOccurs="unbounded"/>
          <xs:element ref="description" minOccurs="0"/>
          <xs:element ref="file" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="laboratory" maxOccurs="unbounded"/>
          <xs:element ref="category"/>
          <xs:element ref="investigator"/>
          <xs:element ref="period"/>
          <xs:element ref="requestDate" minOccurs="0"/>
          <xs:element ref="commissioner" minOccurs="0"/>
          <xs:element ref="reference" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="research" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="genericField" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="object" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="derivedSeries" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

<laboratory>
  <identifier domain="">{0,1}</identifier>
  <name acronym="">{1,1}</name>
  <address>{1,1}</address>
</laboratory>

<xs:element name="laboratory">
  <xs:annotation>
    <xs:documentation xml:lang="EN">The dendrochronological research laboratory where this work was done.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="identifier" minOccurs="0">
        <xs:annotation>
          <xs:documentation xml:lang="EN">Identifier for the laboratory.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="name">
        <xs:complexType>
          <xs:annotation>
            <xs:documentation xml:lang="EN">Name of the laboratory.</xs:documentation>
          </xs:annotation>
          <xs:simpleContent>
            <xs:extension base="xs:string">
              <xs:attribute name="acronym" use="optional">
                <xs:annotation>
                  <xs:documentation>Acronym of the laboratory.</xs:documentation>
                </xs:annotation>
              </xs:attribute>
            </xs:extension>
          </xs:simpleContent>
        </xs:complexType>
      </xs:element>
      <xs:element ref="address"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<xs:element name="name">
  <xs:complexType>
    <xs:annotation>
      <xs:documentation xml:lang="EN">Name of the laboratory.</xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute name="acronym" use="optional">
          <xs:annotation>
            <xs:documentation>Acronym of the laboratory.</xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
</xs:element>

<xs:element name="category">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Category of research this project falls into. Preferably from a controlled vocabulary.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="controlledVoc">
        <xs:attribute name="normalTridas" type="normalTridasCategory">
          <xs:annotation>
            <xs:documentation>TRiDaS controlled vocabulary of research categories.</xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

<xs:element name="investigator" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Principal investigator of this project.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="period" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">When the dendrochronological project took place. Could consist of a start- and end-date. If unknown it should be estimated.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="requestDate" type="date">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Date of the request for dendrochronology. If unknown it should be estimated.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="commissioner" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">The person/organisation who commissioned the project.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="reference" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Citations of publications relating to this project.</xs:documentation>
  </xs:annotation>
</xs:element>

<research>
  <identifier domain="">{1,1}</identifier>
  <description>{1,1}</description>
</research>

<xs:element name="research">
  <xs:annotation>
    <xs:documentation xml:lang="EN">National/International system in which the research project is registered.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="identifier"/>
      <xs:element ref="description"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<object>
  <title>{1,1}</title>
  <identifier domain="">{0,1}</identifier>
  <createdTimestamp certainty="">{0,1}</createdTimestamp>
  <lastModifiedTimestamp certainty="">{0,1}</lastModifiedTimestamp>
  <comments>{0,1}</comments>
</object>

<xs:element name="object">
  <xs:annotation>
    <xs:documentation xml:lang="EN">An object is the item to be investigated. Examples include: violin; excavation site; painting on a wooden panel; water well; church; carving; ship; forest. An object could also be more specific, for example: mast of a ship; roof of a church. Depending on the object type various descriptions are made possible. An object can have one or more elements and can also refer to another (sub) object. For instance a single file may contain three objects: an archaeological site object, within which there is a building object, within which there is a beam object. The list of possible object types is extensible and is thus flexible enough to incorporate the diversity of data required by the dendro community. Only information that is essential for dendrochronological research is recorded here. Other related data may be provided in the form of a link to an external database such as a museum catalogue.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="tridasEntity">
        <xs:sequence>
          <xs:element ref="type"/>
          <xs:element ref="description" minOccurs="0"/>
          <xs:element name="linkSeries" type="seriesLinksWithPreferred" minOccurs="0" maxOccurs="1"/>
          <xs:element ref="file" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="creator" minOccurs="0"/>
          <xs:element ref="owner" minOccurs="0"/>
          <xs:element ref="coverage" minOccurs="0"/>
          <xs:element ref="location" minOccurs="0"/>
          <xs:element ref="genericField" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="object" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="element" minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

<linkSeries>
  <preferredSeries>{0,1}</preferredSeries>
</linkSeries>

<xs:element name="linkSeries" type="seriesLinksWithPreferred" minOccurs="0" maxOccurs="1"/>

<xs:element name="creator" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Name of creator, place of the workshop/wharf etc.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="owner" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Name of the owner of the physical object.</xs:documentation>
  </xs:annotation>
</xs:element>

<coverage>
  <coverageTemporal>{1,1}</coverageTemporal>
  <coverageTemporalFoundation>{1,1}</coverageTemporalFoundation>
</coverage>

<xs:element name="coverage">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Details on the time period this object covers.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:sequence>
      <xs:element ref="coverageTemporal"/>
      <xs:element ref="coverageTemporalFoundation"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

<xs:element name="coverageTemporal" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">If the date is already known in more or less detail: historical period (broad). Equivalent to Dublin Core term 'temporal'.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="coverageTemporalFoundation" type="xs:string">
  <xs:annotation>
    <xs:documentation xml:lang="EN">Method of dating support (e.g. archive sources, inscriptions, stratigraphic context, associated finds, typology, stylistic aspects, carpenter marks, radiocarbon, OSL, other methods).</xs:documentation>
  </xs:annotation>
</xs:element>