OpenEHR Base package
0.1.0 - First Draft International flag

OpenEHR Base package, published by openEHR + HL7. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/FHIR/openehr-base-ig/ and changes regularly. See the Directory of published versions

Logical Model: DV_DURATION - XML Profile

Page standards status: Informative Maturity Level: 3

XML representation of the DV-DURATION logical model.

Raw xml | Download


<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="DV-DURATION"/>
  <text>
    <status value="extensions"/>
    <div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: StructureDefinition DV-DURATION</b></p><a name="DV-DURATION"> </a><a name="hcDV-DURATION"> </a><table border="0" cellpadding="0" cellspacing="0" style="border: 0px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top;"><tr style="border: 1px #F0F0F0 solid; font-size: 11px; font-family: verdana; vertical-align: top"><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="The logical name of the element">Name</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Information about the use of the element">Flags</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Minimum and Maximum # of times the element can appear in the instance">Card.</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px; width: 100px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Reference to the type of the element">Type</a></th><th style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; padding-top: 3px; padding-bottom: 3px" class="hierarchy"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Additional information about the element">Description &amp; Constraints</a><span style="float: right"><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"><img src="data:image/png;base64,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" alt="doco" style="background-color: inherit"/></a></span></th></tr><tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: white"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck1.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_element.gif" alt="." style="background-color: white; background-color: inherit" title="Element" class="hierarchy"/> <a href="StructureDefinition-DV-DURATION-definitions.html#DV_DURATION" title="A data type that represents scale values, where there is:

a) implied ordering, b) no implication that the distance between each value is constant, and c) the total number of values is finite; d) non-integer values are allowed.

  Example:
````  
  Borg CR 10 Scale
  
  0    No Breathlessness at all
  0.5  Very Very Slight (Just Noticeable)
  1    Very Slight
  2    Slight Breathlessness
  3    Moderate
  ... etc
````">DV_DURATION</a><a name="DV_DURATION"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">0..*</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a href="StructureDefinition-DV-AMOUNT.html">DV_AMOUNT</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: white; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><br/>Elements defined in Ancestors:<a href="StructureDefinition-DV-ORDERED.html" title="Optional normal status indicator of value with respect to normal range for this value. Often included by lab, even if the normal range itself is not included. Coded by ordinals in series HHH, HH, H, (nothing), L, LL, LLL; see openEHR terminology group normal_status.">normal_status</a>, <a href="StructureDefinition-DV-ORDERED.html" title="Optional normal range.">normal_range</a>, <a href="StructureDefinition-DV-ORDERED.html" title="Optional tagged other reference ranges for this value in its particular measurement context.">other_reference_ranges</a>, <a href="StructureDefinition-DV-QUANTIFIED.html" title="Optional status of magnitude with values:
* '=' : magnitude is a point value
* '&lt;' : value is &lt; magnitude
* '&gt;' : value is &gt; magnitude
* '&lt;=' : value is &lt;= magnitude
* '&gt;=' : value is &gt;= magnitude
* '~' : value is approximately magnitude

If not present, assumed meaning is '=' .">magnitude_status</a>, <a href="StructureDefinition-DV-QUANTIFIED.html" title="Accuracy of measurement. Exact form of expression determined in descendants.">accuracy</a>, <a href="StructureDefinition-DV-AMOUNT.html" title="If True, indicates that when this object was created, accuracy was recorded as a percent value; if False, as an absolute quantity value.">accuracy_is_percent</a>, <a href="StructureDefinition-DV-AMOUNT.html" title="Accuracy of measurement, expressed either as a half-range percent value (accuracy_is_percent = True) or a half-range quantity. A value of 0 means that accuracy is 100%, i.e. no error.

A value of unknown_accuracy_value means that accuracy was not recorded.">accuracy</a><br/>A data type that represents scale values, where there is: a) implied ordering, b) no implication that the distance between each value is constant, and c) the total number of values is finite; d) non-integer values are allowed<br/></td></tr>
<tr style="border: 0px #F0F0F0 solid; padding:0px; vertical-align: top; background-color: #F7F7F7"><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px; white-space: nowrap; background-image: url(tbl_bck00.png)" class="hierarchy"><img src="tbl_spacer.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="tbl_vjoin_end.png" alt="." style="background-color: inherit" class="hierarchy"/><img src="icon_primitive.png" alt="." style="background-color: #F7F7F7; background-color: inherit" title="Primitive Data Type" class="hierarchy"/> <a href="StructureDefinition-DV-DURATION-definitions.html#DV_DURATION.value" title="Represents a period of time with respect to a notional point in time, which is not specified. A sign may be used to indicate the duration is backwards in time rather than forwards. Used for recording the duration of something in the real world, particularly when there is a need a) to represent the duration in customary format, i.e. days, hours, minutes etc, and b) if it will be used in computational operations with date/time quantities, i.e. additions, subtractions etc. Misuse: Durations cannot be used to represent points in time, or intervals of time.">value</a><a name="DV_DURATION.value"> </a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"/><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">0..1</td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy"><a href="http://hl7.org/fhir/R5/datatypes.html#string">string</a></td><td style="vertical-align: top; text-align : var(--ig-left,left); background-color: #F7F7F7; border: 0px #F0F0F0 solid; padding:0px 4px 0px 4px" class="hierarchy">ISO8601 duration string, including described deviations to support negative values and weeks</td></tr>
<tr><td colspan="5" class="hierarchy"><br/><a href="https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views" title="Legend for this format"><img src="data:image/png;base64,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" alt="doco" style="background-color: inherit"/> Documentation for this format</a></td></tr></table></div>
  </text>
  <extension url="http://hl7.org/fhir/tools/StructureDefinition/web-source">
    <valueUrl
              value="https://specifications.openehr.org/releases/RM/Release-1.1.0/data_types.html#_dv_duration_class"/>
  </extension>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir"/>
  </extension>
  <extension url="http://hl7.org/fhir/tools/StructureDefinition/view-hint">
    <valueCode value="element-view-as-leaf"/>
  </extension>
  <extension url="http://hl7.org/fhir/tools/StructureDefinition/view-hint">
    <valueCode value="element-view-defns-parent"/>
  </extension>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="3">
      <extension
                 url="http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom">
        <valueCanonical
                        value="http://openehr.org/fhir/ImplementationGuide/openehr.base"/>
      </extension>
    </valueInteger>
  </extension>
  <extension
             url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="informative">
      <extension
                 url="http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom">
        <valueCanonical
                        value="http://openehr.org/fhir/ImplementationGuide/openehr.base"/>
      </extension>
    </valueCode>
  </extension>
  <url value="http://openehr.org/fhir/StructureDefinition/DV-DURATION"/>
  <version value="0.1.0"/>
  <name value="DV_DURATION"/>
  <title value="DV_DURATION"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2023-06-27T18:45:58+10:00"/>
  <publisher value="openEHR + HL7"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://www.openehr.org"/>
    </telecom>
  </contact>
  <description
               value="Represents a period of time with respect to a notional point in time, which is not specified. A sign may be used to indicate the duration is backwards in time rather than forwards. Used for recording the duration of something in the real world, particularly when there is a need a) to represent the duration in customary format, i.e. days, hours, minutes etc, and b) if it will be used in computational operations with date/time quantities, i.e. additions, subtractions etc."/>
  <jurisdiction>
    <coding>
      <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/>
      <code value="001"/>
    </coding>
  </jurisdiction>
  <fhirVersion value="5.0.0"/>
  <mapping>
    <identity value="rim"/>
    <uri value="http://hl7.org/v3"/>
    <name value="RIM Mapping"/>
  </mapping>
  <kind value="logical"/>
  <abstract value="false"/>
  <type value="http://openehr.org/fhir/StructureDefinition/DV_DURATION"/>
  <baseDefinition
                  value="http://openehr.org/fhir/StructureDefinition/DV-AMOUNT"/>
  <derivation value="specialization"/>
  <snapshot>
    <extension
               url="http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version">
      <valueString value="0.1.0"/>
    </extension>
    <element id="DV_DURATION">
      <path value="DV_DURATION"/>
      <short
             value="A data type that represents scale values, where there is: a) implied ordering, b) no implication that the distance between each value is constant, and c) the total number of values is finite; d) non-integer values are allowed"/>
      <definition
                  value="A data type that represents scale values, where there is:

a) implied ordering, b) no implication that the distance between each value is constant, and c) the total number of values is finite; d) non-integer values are allowed.

  Example:
````  
  Borg CR 10 Scale
  
  0    No Breathlessness at all
  0.5  Very Very Slight (Just Noticeable)
  1    Very Slight
  2    Slight Breathlessness
  3    Moderate
  ... etc
````"/>
      <comment
               value="For scores that include only Integers, DV_DURATION may also be used, but DV_ORDINAL should be supported to accommodate existing data instances of that type."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="Base"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <isModifier value="false"/>
      <mapping>
        <identity value="rim"/>
        <map value="n/a"/>
      </mapping>
    </element>
    <element id="DV_DURATION.normal-status">
      <path value="DV_DURATION.normal_status"/>
      <short
             value="Optional normal status indicator of value with respect to normal range for this value"/>
      <definition
                  value="Optional normal status indicator of value with respect to normal range for this value. Often included by lab, even if the normal range itself is not included. Coded by ordinals in series HHH, HH, H, (nothing), L, LL, LLL; see openEHR terminology group normal_status."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DV_ORDERED.normal_status"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code
              value="http://openehr.org/fhir/StructureDefinition/CODE-PHRASE"/>
      </type>
      <isModifier value="false"/>
      <binding>
        <strength value="required"/>
        <valueSet
                  value="https://specifications.openehr.org/fhir/valueset-normal_statuses"/>
      </binding>
    </element>
    <element id="DV_DURATION.normal-range">
      <path value="DV_DURATION.normal_range"/>
      <short value="Optional normal range"/>
      <definition value="Optional normal range."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DV_ORDERED.normal_range"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <extension
                   url="http://hl7.org/fhir/tools/StructureDefinition/type-parameter">
          <extension url="name">
            <valueCode value="T"/>
          </extension>
          <extension url="type">
            <valueUri
                      value="http://openehr.org/fhir/StructureDefinition/DV_ORDERED"/>
          </extension>
        </extension>
        <code
              value="http://openehr.org/fhir/StructureDefinition/DV-INTERVAL"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="DV_DURATION.other-reference-ranges">
      <path value="DV_DURATION.other_reference_ranges"/>
      <short
             value="Optional tagged other reference ranges for this value in its particular measurement context"/>
      <definition
                  value="Optional tagged other reference ranges for this value in its particular measurement context."/>
      <min value="0"/>
      <max value="*"/>
      <base>
        <path value="DV_ORDERED.other_reference_ranges"/>
        <min value="0"/>
        <max value="*"/>
      </base>
      <type>
        <extension
                   url="http://hl7.org/fhir/tools/StructureDefinition/type-parameter">
          <extension url="name">
            <valueCode value="T"/>
          </extension>
          <extension url="type">
            <valueUri
                      value="http://openehr.org/fhir/StructureDefinition/DV_ORDERED"/>
          </extension>
        </extension>
        <code
              value="http://openehr.org/fhir/StructureDefinition/REFERENCE-RANGE"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="DV_DURATION.magnitude-status">
      <path value="DV_DURATION.magnitude_status"/>
      <short
             value="Optional status of magnitude: =, &lt;, &gt;, &lt;=, &gt;=, ~"/>
      <definition
                  value="Optional status of magnitude with values:
* '=' : magnitude is a point value
* '&lt;' : value is &lt; magnitude
* '&gt;' : value is &gt; magnitude
* '&lt;=' : value is &lt;= magnitude
* '&gt;=' : value is &gt;= magnitude
* '~' : value is approximately magnitude

If not present, assumed meaning is '=' ."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DV_QUANTIFIED.magnitude_status"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="DV_DURATION.accuracy">
      <path value="DV_DURATION.accuracy"/>
      <short
             value="Accuracy of measurement, expressed either as a half-range percent value (accuracy_is_percent = True) or a half-range quantity"/>
      <definition
                  value="Accuracy of measurement, expressed either as a half-range percent value (accuracy_is_percent = True) or a half-range quantity. A value of 0 means that accuracy is 100%, i.e. no error.

A value of unknown_accuracy_value means that accuracy was not recorded."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DV_QUANTIFIED.accuracy"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="decimal"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="DV_DURATION.accuracy-is-percent">
      <path value="DV_DURATION.accuracy_is_percent"/>
      <short
             value="If True, indicates that when this object was created, accuracy was recorded as a percent value; if False, as an absolute quantity value"/>
      <definition
                  value="If True, indicates that when this object was created, accuracy was recorded as a percent value; if False, as an absolute quantity value."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DV_AMOUNT.accuracy_is_percent"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="boolean"/>
      </type>
      <isModifier value="false"/>
    </element>
    <element id="DV_DURATION.value">
      <path value="DV_DURATION.value"/>
      <short
             value="ISO8601 duration string, including described deviations to support negative values and weeks"/>
      <definition
                  value="Represents a period of time with respect to a notional point in time, which is not specified. A sign may be used to indicate the duration is backwards in time rather than forwards. Used for recording the duration of something in the real world, particularly when there is a need a) to represent the duration in customary format, i.e. days, hours, minutes etc, and b) if it will be used in computational operations with date/time quantities, i.e. additions, subtractions etc. Misuse: Durations cannot be used to represent points in time, or intervals of time."/>
      <comment
               value="Two deviations from ISO 8601 are supported, the first, to allow a negative sign, and the second allowing the 'W' designator to be mixed with other designators. See time types section in the Foundation Types model."/>
      <min value="0"/>
      <max value="1"/>
      <base>
        <path value="DV_DURATION.value"/>
        <min value="0"/>
        <max value="1"/>
      </base>
      <type>
        <code value="string"/>
      </type>
      <isModifier value="false"/>
    </element>
  </snapshot>
  <differential>
    <element id="DV_DURATION">
      <path value="DV_DURATION"/>
      <short
             value="A data type that represents scale values, where there is: a) implied ordering, b) no implication that the distance between each value is constant, and c) the total number of values is finite; d) non-integer values are allowed"/>
      <definition
                  value="A data type that represents scale values, where there is:

a) implied ordering, b) no implication that the distance between each value is constant, and c) the total number of values is finite; d) non-integer values are allowed.

  Example:
````  
  Borg CR 10 Scale
  
  0    No Breathlessness at all
  0.5  Very Very Slight (Just Noticeable)
  1    Very Slight
  2    Slight Breathlessness
  3    Moderate
  ... etc
````"/>
      <comment
               value="For scores that include only Integers, DV_DURATION may also be used, but DV_ORDINAL should be supported to accommodate existing data instances of that type."/>
      <min value="0"/>
      <max value="*"/>
      <isModifier value="false"/>
    </element>
    <element id="DV_DURATION.value">
      <path value="DV_DURATION.value"/>
      <short
             value="ISO8601 duration string, including described deviations to support negative values and weeks"/>
      <definition
                  value="Represents a period of time with respect to a notional point in time, which is not specified. A sign may be used to indicate the duration is backwards in time rather than forwards. Used for recording the duration of something in the real world, particularly when there is a need a) to represent the duration in customary format, i.e. days, hours, minutes etc, and b) if it will be used in computational operations with date/time quantities, i.e. additions, subtractions etc. Misuse: Durations cannot be used to represent points in time, or intervals of time."/>
      <comment
               value="Two deviations from ISO 8601 are supported, the first, to allow a negative sign, and the second allowing the 'W' designator to be mixed with other designators. See time types section in the Foundation Types model."/>
      <min value="0"/>
      <max value="1"/>
      <type>
        <code value="string"/>
      </type>
      <isModifier value="false"/>
    </element>
  </differential>
</StructureDefinition>