Introduction

The temporality model defines temporary changes within the AIXM 5.1 information exchange model. A temporary change describes the transitory overlay of a feature state during a temporary event. A temporal change is defined as a Temporary Delta Time Slice (TEMPDELTA). Within the temporality rules, the only feature attribute that is situated outside the time slice and cannot have a start/end of validity is the "gml:identifier". This feature attribute is also used as an identification of the feature for which the time slice is valid.

Feature information in a Temporary Delta Time Slice needs to be distinguished from information in a Baseline Time Slice. An additional attribute is used for this purpose: AIXMFeatureTimeSlice class. This attribute is named “interpretation” and indicates the type of time slice: BASELINE or TEMPDELTA. A temporary change includes just the values of the properties that are temporarily changed with reference to the Basline these changes apply to.

It is important to point out that not all temporal changes encoded as TEMPDELTA time slice are D-NOTAMs, although teh D_NOTAM concept is based on TEMPDELTA time slices.

Use Case example

The following example provides an overview of feature TaxiwayElement and its time slices.

A BASELINE 1 time slice is encoded from 1.9.2020 00:00:00 UTC to an unknown date/time.The Availibility propoperty captures the opertational status set to "NORMAL".
A TEMPDELTA time slice is encoded to capture a temporary change of the TaxiwayElement attribute 'Availability' and sets the operational status from "NORMAL" to "CLOSED" with a start of validity at 10.09.2020 00:00:00 UTC and an end of validity at14.10.2020 23:59:00 UTC. Within the time of validity of the TEMPDELTA time slice, the Availability property value of the TEMPDELTA will replace the value of the BASELINE as displayed on the picture below.

Figure 1: Time Slice overview of feature TaxiwayElement

Figure 2: TEMPDELTA values overlapping the BASELINE values winthin the validity of TEMPDELTA

Time Slices

Below are coding examples and downloadable xml files for the BASELINE, TEMPDELTA Time Slices for the feature TaxiwayElement. Last xml example provides the conjunction of these two time slices.

BASELINE

  <hasMember>
    <aixm:TaxiwayElement gml:id="uuid.190eb7f6-59e8-4a02-aa88-891f362ace80">
      <gml:identifier codeSpace="urn:uuid:">190eb7f6-59e8-4a02-aa88-891f362ace80</gml:identifier>
      <aixm:timeSlice>
        <aixm:TaxiwayElementTimeSlice gml:id="uuid.f18c4430-10b6-4527-a2a0-e2d458c97354">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.ed94bd68-35ee-4100-b226-11d9b7df226b">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </gml:validTime>
          <aixm:interpretation>BASELINE</aixm:interpretation>
          <aixm:sequenceNumber>1</aixm:sequenceNumber>
          <aixm:correctionNumber>0</aixm:correctionNumber>
          <aixm:featureLifetime>
            <gml:TimePeriod gml:id="uuid.6b0313a0-24e7-4c32-8653-86ce1bbde579">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </aixm:featureLifetime>
          <aixm:gradeSeparation>OVERPASS</aixm:gradeSeparation>
          <aixm:surfaceProperties>
            <aixm:SurfaceCharacteristics gml:id="uuid.18f56673-cb6c-4e87-b426-e19b00eb2133">
              <aixm:composition>CONC_ASPH</aixm:composition>
              <aixm:classPCN>60</aixm:classPCN>
            </aixm:SurfaceCharacteristics>
          </aixm:surfaceProperties>
          <aixm:associatedTaxiway xlink:href="#3ae48a00-5f20-42c4-bb60-032252a56aa6" xlink:title="Z" />
          <aixm:extent>
            <aixm:ElevatedSurface gml:id="uuid.05e27bc1-e084-494f-9fe6-51685cc62151" srsName="urn:ogc:def:crs:EPSG::4326">
              <gml:patches>
                <gml:PolygonPatch>
                  <gml:exterior>
                    <gml:Ring>
                      <gml:curveMember>
                        <gml:Curve gml:id="uuid.009eab02-fdd5-44d4-abdb-304617832a73">
                          <gml:segments>
                            <gml:GeodesicString interpolation="geodesic">
                              <gml:posList>50.11561669 14.27360331 50.11551241 14.27367976 50.11540859 14.2737558 50.11540694 14.27440079 50.11538562 14.27479029 50.11538173 14.27484325 50.11537665 14.27489597 50.11537041 14.27494838 50.11536301 14.27500043 50.11535446 14.27505205 50.11534476 14.27510318 50.11533394 14.27515376 50.115322 14.27520373 50.11530895 14.27525302 50.11529482 14.27530159 50.11527962 14.27534936 50.11526336 14.27539629 50.11524607 14.27544232 50.11522778 14.2754874 50.11520849 14.27553146 50.11518823 14.27557446 50.11516703 14.27561635 50.11514491 14.27565707 50.1151219 14.27569659 50.11509803 14.27573484 50.11507332 14.27577178 50.1150478 14.27580738 50.11502151 14.27584158 50.11499448 14.27587435 50.11496673 14.27590565 50.11493831 14.27593544 50.11490924 14.27596369 50.11487956 14.27599035 50.1148493 14.27601541 50.11481851 14.27603883 50.11478721 14.27606057 50.11475546 14.27608063 50.11472327 14.27609896 50.11437822 14.27628525 50.11436716 14.27629088 50.11435598 14.27629591 50.1143447 14.27630032 50.11433332 14.27630412 50.11432187 14.2763073 50.11431035 14.27630985 50.11429878 14.27631177 50.11428717 14.27631307 50.11427555 14.27631373 50.11426391 14.27631376 50.11425228 14.27631315 50.11424067 14.27631192 50.1142291 14.27631005 50.11421758 14.27630756 50.11420611 14.27630444 50.11419473 14.2763007 50.11418344 14.27629634 50.11417225 14.27629137 50.11416118 14.27628579 50.11415024 14.27627962 50.11413945 14.27627286 50.11412882 14.27626551 50.11411835 14.27625759 50.11410808 14.27624911 50.114098 14.27624007 50.11408813 14.27623049 50.11407848 14.27622038 50.11406906 14.27620975 50.11405989 14.27619861 50.11405097 14.27618698 50.11404233 14.27617488 50.11403395 14.27616231 50.11402587 14.2761493 50.11401809 14.27613585 50.11401061 14.27612199 50.11400344 14.27610773 50.11399661 14.27609309 50.1139901 14.27607808 50.11398394 14.27606273 50.11397813 14.27604706 50.11397267 14.27603108 50.11396757 14.27601481 50.11436666 14.27735098 50.11436289 14.27733321 50.11435952 14.27731525 50.11435655 14.27729712 50.11435398 14.27727884 50.11435182 14.27726044 50.11435007 14.27724193 50.11434874 14.27722333 50.11434782 14.27720468 50.11434731 14.27718598 50.11434722 14.27716727 50.11434755 14.27714857 50.11434829 14.2771299 50.11434945 14.27711127 50.11435102 14.27709272 50.114353 14.27707427 50.11435539 14.27705593 50.11435819 14.27703774 50.11436139 14.2770197 50.11436499 14.27700185 50.11436898 14.2769842 50.11437337 14.27696678 50.11437814 14.2769496 50.11438328 14.27693269 50.11438881 14.27691606 50.11439469 14.27689975 50.11440094 14.27688376 50.11440754 14.27686811 50.11441448 14.27685283 50.11442176 14.27683793 50.11442936 14.27682343 50.11443728 14.27680935 50.11444551 14.27679571 50.11445404 14.27678251 50.11446286 14.27676978 50.11447196 14.27675753 50.11448132 14.27674578 50.11449093 14.27673454 50.1145008 14.27672382 50.11451089 14.27671364 50.11452121 14.27670401 50.11502174 14.27625441 50.11505691 14.27622154 50.11509133 14.27618679 50.11512057 14.27615291 50.11512495 14.2761502 50.11515774 14.27611182 50.11516451 14.27610243 50.11518964 14.2760717 50.11520706 14.27604745 50.11522064 14.27602988 50.11524738 14.27598999 50.11525068 14.27598641 50.11527974 14.27594134 50.11528643 14.27592942 50.11530777 14.27589473 50.11532361 14.27586628 50.11533475 14.27584664 50.11535872 14.27580021 50.11536063 14.27579712 50.1153854 14.27574624 50.11539161 14.2757318 50.11540901 14.27569405 50.11542262 14.27566154 50.11543145 14.27564061 50.11545159 14.2755879 50.11545268 14.275586 50.11547268 14.27553028 50.11547803 14.27551327 50.11549142 14.27547351 50.11550226 14.27543629 50.11550889 14.27541576 50.11552506 14.2753571 50.1155399 14.27529761 50.11554432 14.27527778 50.11555342 14.27523735 50.11556134 14.27519644 50.11556558 14.2751764 50.11557637 14.27511483 50.11557635 14.27511383 50.11558578 14.27505271 50.11558855 14.27503029 50.1155938 14.27499012 50.1155982 14.2749456 50.11560042 14.27492714 50.11560563 14.27486384 50.11560547 14.27486073 50.11560942 14.2748003 50.11561009 14.27477572 50.1156118 14.27473658 50.11561228 14.27469082 50.11561275 14.27467278 50.11561285 14.27462038 50.11561328 14.27455026 50.11561342 14.27448006 50.11561346 14.27441073 50.11561387 14.27434048 50.11561417 14.27427095 50.11561441 14.27420087 50.11561475 14.27413077 50.11561512 14.27406109 50.11561527 14.27399103 50.11561582 14.2739213 50.11561604 14.27385095 50.11561598 14.2737815 50.11561649 14.27371136 50.11561669 14.27360331</gml:posList>
                            </gml:GeodesicString>
                          </gml:segments>
                        </gml:Curve>
                      </gml:curveMember>
                    </gml:Ring>
                  </gml:exterior>
                </gml:PolygonPatch>
              </gml:patches>
              <aixm:horizontalAccuracy uom="M">1</aixm:horizontalAccuracy>
              <aixm:elevation uom="M">376</aixm:elevation>
              <aixm:verticalAccuracy uom="M">0.5</aixm:verticalAccuracy>
            </aixm:ElevatedSurface>
          </aixm:extent>
          <aixm:availability>
            <aixm:ManoeuvringAreaAvailability gml:id="uuid.a861adfd-6768-45a4-ab3d-9d717fe1066d">
              <aixm:operationalStatus>NORMAL</aixm:operationalStatus>
              <aixm:usage>
                <aixm:ManoeuvringAreaUsage gml:id="uuid.7fd48b46-c8ad-44cf-9a6a-95b2a8e9cc0c">
                  <aixm:type>FORBID</aixm:type>
                  <aixm:selection>
                    <aixm:ConditionCombination gml:id="uuid.cd6d8b88-9926-4fa8-960e-34e84c7c85b5">
                      <aixm:aircraft>
                        <aixm:AircraftCharacteristic gml:id="uuid.6cf73806-3d74-43f3-8854-7615a57feb6a">
                          <aixm:typeAircraftICAO>B748</aixm:typeAircraftICAO>
                        </aixm:AircraftCharacteristic>
                      </aixm:aircraft>
                    </aixm:ConditionCombination>
                  </aixm:selection>
                </aixm:ManoeuvringAreaUsage>
              </aixm:usage>
            </aixm:ManoeuvringAreaAvailability>
          </aixm:availability>
        </aixm:TaxiwayElementTimeSlice>
      </aixm:timeSlice>
    </aixm:TaxiwayElement>
  </hasMember>

BL_TaxiwayElement.xml

TEMPDELTA

  <hasMember>
    <aixm:TaxiwayElement gml:id="uuid.190eb7f6-59e8-4a02-aa88-891f362ace80">
      <gml:identifier codeSpace="urn:uuid:">190eb7f6-59e8-4a02-aa88-891f362ace80</gml:identifier>
      <aixm:timeSlice>
        <aixm:TaxiwayElementTimeSlice gml:id="uuid.a8f14e4f-8fe2-4a57-94c6-54bd3bf62575">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.0b0a057a-41a2-4f0e-a1b0-7b3c2490015f">
              <gml:beginPosition>2020-09-10T00:00:00Z</gml:beginPosition>
              <gml:endPosition>2020-09-14T23:59:00Z</gml:endPosition>
            </gml:TimePeriod>
          </gml:validTime>
          <aixm:interpretation>TEMPDELTA</aixm:interpretation>
          <aixm:sequenceNumber>1</aixm:sequenceNumber>
          <aixm:correctionNumber>0</aixm:correctionNumber>
          <aixm:availability>
            <aixm:ManoeuvringAreaAvailability gml:id="uuid.9b654997-4370-4a83-9982-027468143720">
              <aixm:operationalStatus>CLOSED</aixm:operationalStatus>
            </aixm:ManoeuvringAreaAvailability>
          </aixm:availability>
        </aixm:TaxiwayElementTimeSlice>
      </aixm:timeSlice>
    </aixm:TaxiwayElement>
  </hasMember>

TD_TaxiwayElement.xml

BASELINE + TEMPDELTA

  <hasMember>
    <aixm:TaxiwayElement gml:id="uuid.190eb7f6-59e8-4a02-aa88-891f362ace80">
      <gml:identifier codeSpace="urn:uuid:">190eb7f6-59e8-4a02-aa88-891f362ace80</gml:identifier>
      <aixm:timeSlice>
        <aixm:TaxiwayElementTimeSlice gml:id="uuid.f18c4430-10b6-4527-a2a0-e2d458c97354">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.ed94bd68-35ee-4100-b226-11d9b7df226b">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </gml:validTime>
          <aixm:interpretation>BASELINE</aixm:interpretation>
          <aixm:sequenceNumber>1</aixm:sequenceNumber>
          <aixm:correctionNumber>0</aixm:correctionNumber>
          <aixm:featureLifetime>
            <gml:TimePeriod gml:id="uuid.6b0313a0-24e7-4c32-8653-86ce1bbde579">
              <gml:beginPosition>2020-09-01T00:00:00Z</gml:beginPosition>
              <gml:endPosition indeterminatePosition="unknown" />
            </gml:TimePeriod>
          </aixm:featureLifetime>
          <aixm:gradeSeparation>OVERPASS</aixm:gradeSeparation>
          <aixm:surfaceProperties>
            <aixm:SurfaceCharacteristics gml:id="uuid.18f56673-cb6c-4e87-b426-e19b00eb2133">
              <aixm:composition>CONC_ASPH</aixm:composition>
              <aixm:classPCN>60</aixm:classPCN>
            </aixm:SurfaceCharacteristics>
          </aixm:surfaceProperties>
          <aixm:associatedTaxiway xlink:href="#3ae48a00-5f20-42c4-bb60-032252a56aa6" xlink:title="Z" />
          <aixm:extent>
            <aixm:ElevatedSurface gml:id="uuid.05e27bc1-e084-494f-9fe6-51685cc62151" srsName="urn:ogc:def:crs:EPSG::4326">
              <gml:patches>
                <gml:PolygonPatch>
                  <gml:exterior>
                    <gml:Ring>
                      <gml:curveMember>
                        <gml:Curve gml:id="uuid.009eab02-fdd5-44d4-abdb-304617832a73">
                          <gml:segments>
                            <gml:GeodesicString interpolation="geodesic">
                              <gml:posList>50.11561669 14.27360331 50.11551241 14.27367976 50.11540859 14.2737558 50.11540694 14.27440079 50.11538562 14.27479029 50.11538173 14.27484325 50.11537665 14.27489597 50.11537041 14.27494838 50.11536301 14.27500043 50.11535446 14.27505205 50.11534476 14.27510318 50.11533394 14.27515376 50.115322 14.27520373 50.11530895 14.27525302 50.11529482 14.27530159 50.11527962 14.27534936 50.11526336 14.27539629 50.11524607 14.27544232 50.11522778 14.2754874 50.11520849 14.27553146 50.11518823 14.27557446 50.11516703 14.27561635 50.11514491 14.27565707 50.1151219 14.27569659 50.11509803 14.27573484 50.11507332 14.27577178 50.1150478 14.27580738 50.11502151 14.27584158 50.11499448 14.27587435 50.11496673 14.27590565 50.11493831 14.27593544 50.11490924 14.27596369 50.11487956 14.27599035 50.1148493 14.27601541 50.11481851 14.27603883 50.11478721 14.27606057 50.11475546 14.27608063 50.11472327 14.27609896 50.11437822 14.27628525 50.11436716 14.27629088 50.11435598 14.27629591 50.1143447 14.27630032 50.11433332 14.27630412 50.11432187 14.2763073 50.11431035 14.27630985 50.11429878 14.27631177 50.11428717 14.27631307 50.11427555 14.27631373 50.11426391 14.27631376 50.11425228 14.27631315 50.11424067 14.27631192 50.1142291 14.27631005 50.11421758 14.27630756 50.11420611 14.27630444 50.11419473 14.2763007 50.11418344 14.27629634 50.11417225 14.27629137 50.11416118 14.27628579 50.11415024 14.27627962 50.11413945 14.27627286 50.11412882 14.27626551 50.11411835 14.27625759 50.11410808 14.27624911 50.114098 14.27624007 50.11408813 14.27623049 50.11407848 14.27622038 50.11406906 14.27620975 50.11405989 14.27619861 50.11405097 14.27618698 50.11404233 14.27617488 50.11403395 14.27616231 50.11402587 14.2761493 50.11401809 14.27613585 50.11401061 14.27612199 50.11400344 14.27610773 50.11399661 14.27609309 50.1139901 14.27607808 50.11398394 14.27606273 50.11397813 14.27604706 50.11397267 14.27603108 50.11396757 14.27601481 50.11436666 14.27735098 50.11436289 14.27733321 50.11435952 14.27731525 50.11435655 14.27729712 50.11435398 14.27727884 50.11435182 14.27726044 50.11435007 14.27724193 50.11434874 14.27722333 50.11434782 14.27720468 50.11434731 14.27718598 50.11434722 14.27716727 50.11434755 14.27714857 50.11434829 14.2771299 50.11434945 14.27711127 50.11435102 14.27709272 50.114353 14.27707427 50.11435539 14.27705593 50.11435819 14.27703774 50.11436139 14.2770197 50.11436499 14.27700185 50.11436898 14.2769842 50.11437337 14.27696678 50.11437814 14.2769496 50.11438328 14.27693269 50.11438881 14.27691606 50.11439469 14.27689975 50.11440094 14.27688376 50.11440754 14.27686811 50.11441448 14.27685283 50.11442176 14.27683793 50.11442936 14.27682343 50.11443728 14.27680935 50.11444551 14.27679571 50.11445404 14.27678251 50.11446286 14.27676978 50.11447196 14.27675753 50.11448132 14.27674578 50.11449093 14.27673454 50.1145008 14.27672382 50.11451089 14.27671364 50.11452121 14.27670401 50.11502174 14.27625441 50.11505691 14.27622154 50.11509133 14.27618679 50.11512057 14.27615291 50.11512495 14.2761502 50.11515774 14.27611182 50.11516451 14.27610243 50.11518964 14.2760717 50.11520706 14.27604745 50.11522064 14.27602988 50.11524738 14.27598999 50.11525068 14.27598641 50.11527974 14.27594134 50.11528643 14.27592942 50.11530777 14.27589473 50.11532361 14.27586628 50.11533475 14.27584664 50.11535872 14.27580021 50.11536063 14.27579712 50.1153854 14.27574624 50.11539161 14.2757318 50.11540901 14.27569405 50.11542262 14.27566154 50.11543145 14.27564061 50.11545159 14.2755879 50.11545268 14.275586 50.11547268 14.27553028 50.11547803 14.27551327 50.11549142 14.27547351 50.11550226 14.27543629 50.11550889 14.27541576 50.11552506 14.2753571 50.1155399 14.27529761 50.11554432 14.27527778 50.11555342 14.27523735 50.11556134 14.27519644 50.11556558 14.2751764 50.11557637 14.27511483 50.11557635 14.27511383 50.11558578 14.27505271 50.11558855 14.27503029 50.1155938 14.27499012 50.1155982 14.2749456 50.11560042 14.27492714 50.11560563 14.27486384 50.11560547 14.27486073 50.11560942 14.2748003 50.11561009 14.27477572 50.1156118 14.27473658 50.11561228 14.27469082 50.11561275 14.27467278 50.11561285 14.27462038 50.11561328 14.27455026 50.11561342 14.27448006 50.11561346 14.27441073 50.11561387 14.27434048 50.11561417 14.27427095 50.11561441 14.27420087 50.11561475 14.27413077 50.11561512 14.27406109 50.11561527 14.27399103 50.11561582 14.2739213 50.11561604 14.27385095 50.11561598 14.2737815 50.11561649 14.27371136 50.11561669 14.27360331</gml:posList>
                            </gml:GeodesicString>
                          </gml:segments>
                        </gml:Curve>
                      </gml:curveMember>
                    </gml:Ring>
                  </gml:exterior>
                </gml:PolygonPatch>
              </gml:patches>
              <aixm:horizontalAccuracy uom="M">1</aixm:horizontalAccuracy>
              <aixm:elevation uom="M">376</aixm:elevation>
              <aixm:verticalAccuracy uom="M">0.5</aixm:verticalAccuracy>
            </aixm:ElevatedSurface>
          </aixm:extent>
          <aixm:availability>
            <aixm:ManoeuvringAreaAvailability gml:id="uuid.a861adfd-6768-45a4-ab3d-9d717fe1066d">
              <aixm:operationalStatus>NORMAL</aixm:operationalStatus>
              <aixm:usage>
                <aixm:ManoeuvringAreaUsage gml:id="uuid.7fd48b46-c8ad-44cf-9a6a-95b2a8e9cc0c">
                  <aixm:type>FORBID</aixm:type>
                  <aixm:selection>
                    <aixm:ConditionCombination gml:id="uuid.cd6d8b88-9926-4fa8-960e-34e84c7c85b5">
                      <aixm:aircraft>
                        <aixm:AircraftCharacteristic gml:id="uuid.6cf73806-3d74-43f3-8854-7615a57feb6a">
                          <aixm:typeAircraftICAO>B748</aixm:typeAircraftICAO>
                        </aixm:AircraftCharacteristic>
                      </aixm:aircraft>
                    </aixm:ConditionCombination>
                  </aixm:selection>
                </aixm:ManoeuvringAreaUsage>
              </aixm:usage>
            </aixm:ManoeuvringAreaAvailability>
          </aixm:availability>
        </aixm:TaxiwayElementTimeSlice>
      </aixm:timeSlice>
      <aixm:timeSlice>
        <aixm:TaxiwayElementTimeSlice gml:id="uuid.7c62bc72-a0e5-4f72-8ac0-a8f31b69fe57">
          <gml:validTime>
            <gml:TimePeriod gml:id="uuid.66767105-5e31-4a66-a6ee-7b1f2369a745">
              <gml:beginPosition>2020-09-10T00:00:00Z</gml:beginPosition>
              <gml:endPosition>2020-09-14T23:59:00Z</gml:endPosition>
            </gml:TimePeriod>
          </gml:validTime>
          <aixm:interpretation>TEMPDELTA</aixm:interpretation>
          <aixm:sequenceNumber>1</aixm:sequenceNumber>
          <aixm:correctionNumber>0</aixm:correctionNumber>
          <aixm:availability>
            <aixm:ManoeuvringAreaAvailability gml:id="uuid.7bc3f654-b3f2-4589-9d7f-e0142d034b56">
              <aixm:operationalStatus>CLOSED</aixm:operationalStatus>
            </aixm:ManoeuvringAreaAvailability>
          </aixm:availability>
        </aixm:TaxiwayElementTimeSlice>
      </aixm:timeSlice>
    </aixm:TaxiwayElement>
  </hasMember>

BL_TD_TaxiwayElement.xml

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