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</wcs:CoverageDescriptions></pre>
=== End-to-End Order Example (using Python) ===
The following steps use Python to search the EODMS_Catalog CSW and WCS services to order a Radarsat-1 image from the EODMS. For this example, the following restrictions will be place on the query:* A bounding box surrounding the City of Ottawa city limits with coordinates:: <code>lower corner: -76.3556 44.9617</code>: <code>upper corner: -75.2466 45.5371</code>* All dates before to March 29, 2013 as this was the last day Radarsat-1 transmitted data ==== Python Packages ==== The only Python package that needs to be installed prior running these scripts is the Requests package (Checkout out our [https://realpythongithub.com/python-requests/). It can be installed by running the command <code>pip install requests</code>. ==== GetRecords POST Request ==== SET VARIABLES First step is to set the input parameters (restrictions listed above) for the '''GetRecords''' request. Python code:<pre style="background-color:#EEFFCC; border-color:#AACC99"># Set specific parameterslower_corner = '-76.3556 44.9617'upper_corner = '-75.2466 45.5371'end_date = '2013-03-29Z'</pre> CREATE REQUEST XML Next, create the XML POST '''GetRecords''' request with the above variables. The request tells the CSW to return the first 15 records based on these variables (or search criteria).NOTE: To change the number of records returned, change the <code>maxRecords</code> attribute in the XML below to the desired value. GetRecords POST request example:<pre><?xml version="1.0" encoding="UTF-8"?><csw:GetRecords service='CSW' version='2.0.2' maxRecords='15' startPosition='1' resultType='results' outputFormat='application/xml' outputSchema='http://www.opengis.net/cat/csw/2.0.2' xmlns='http://www.opengis.net/cat/csw/2.0.2' xmlns:csw='http://www.opengis.net/cat/csw/2.0.2' xmlns:ogc='http://www.opengis.net/ogc' xmlns:ows='http://www.opengis.net/ows' xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:dct='http://purl.org/dc/terms/' xmlns:gml='http://www.opengis.net/gml' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd'> <csw:Query typeNames='csw:Record'> <csw:ElementSetName typeNames='csw:Record'>full</csw:ElementSetName> <csw:Constraint version="1.1.0"> <ogc:Filter> <ogc:And> <ogc:PropertyIsLessThan> <ogc:PropertyName>dc:date</ogc:PropertyName> <ogc:Literal>%s</ogc:Literal> </ogc:PropertyIsLessThan> <ogc:PropertyIsLike escapeChar='\\' singleChar='?' wildCard='*'> <ogc:PropertyName>dc:title</ogc:PropertyName> <ogc:Literal>*</ogc:Literal> </ogc:PropertyIsLike> <ogc:BBOX> <ogc:PropertyName>ows:BoundingBox</ogc:PropertyName> <gml:Envelope> <gml:lowerCorner>%s</gml:lowerCorner> <gml:upperCorner>%s</gml:upperCorner> </gml:Envelope> </ogc:BBOX> </ogc:And> </ogc:Filter> </csw:Constraint> </csw:Query></csw:GetRecords></pre> Python code of request: <pre style="background-color:#EEFFCC; bordernrcan-color:#AACC99"># Submit a GetRecords to the CSWpost_xml = '''<?xml version="1.0" encoding="UTF-8"?><csw:GetRecords service='CSW' version='2.0.2' maxRecords='15' startPosition='1' resultType='results' outputFormat='application/xml' outputSchema='http://www.opengis.net/cat/csw/2.0.2' xmlns='http://www.opengis.net/cat/csw/2.0.2' xmlns:csw='http://www.opengis.net/cat/csw/2.0.2' xmlns:ogc='http://www.opengis.net/ogc' xmlns:ows='http://www.opengis.net/ows' xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:dct='http://purl.org/dc/terms/' xmlns:gml='http://www.opengis.net/gml' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd'> <csw:Query typeNames='csw:Record'> <csw:ElementSetName typeNames='csw:Record'>full</csw:ElementSetName> <csw:Constraint version="1.1.0"> <ogc:Filter> <ogc:And> <ogc:PropertyIsLessThan> <ogc:PropertyName>dc:date</ogc:PropertyName> <ogc:Literal>%s</ogc:Literal> </ogc:PropertyIsLessThan> <ogc:PropertyIsLike escapeChar='\\' singleChar='?' wildCard='*'> <ogc:PropertyName>dc:title</ogc:PropertyName> <ogc:Literal>*</ogc:Literal> </ogc:PropertyIsLike> <ogc:BBOX> <ogc:PropertyName>ows:BoundingBox</ogc:PropertyName> <gml:Envelope> <gml:lowerCorner>%s</gml:lowerCorner> <gml:upperCorner>%s</gml:upperCorner> </gml:Envelope> </ogc:BBOX> </ogc:And> </ogc:Filter> </csw:Constraint> </csw:Query></csw:GetRecords>''' % (end_date, lower_corner, upper_corner)</pre> SEND THE REQUEST The next step is to send the request to the WCS URL. In Python, use the requests object to send a POST request: <pre style="background-color:#EEFFCC; border-color:#AACC99">csw_url = 'https://www.eodms-sgdot.nrcan-rncan.gc.ca/MetaManagerCSW' \ '/csw/eodms_catalog'headers = {'Content-Type':'application/xml'}csw_r = requests.post(csw_url, data=post_xml)</pre> The GetRecords response will contain all the records up to the <code>maxRecords</code> value (in this case the first 15). The following HTTP response will be returned from the CSW: <pre><?xml version="1.0" encoding="UTF-8"?><GetRecordsResponse xmlns="http://www.opengis.net/cat/csw/2.0.2"> <SearchStatus timestamp="2019-11-22T04:11:02-05:00"/> <SearchResults numberOfRecordsMatched="705" numberOfRecordsReturned="15" nextRecord="16"> <csw:Record xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ows="http://www.opengis.net/ows" xmlns:dct="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/"> <dc:identifier>1508208</dc:identifier> <dc:title>Radarsat-1 Raw Scenes</dc:title> <dc:type>dataset</dc:type> <dc:subject>Satellites, Imaging,Radar, Digital Collection, Mapping, Spatial Data, Remote Sensing </dc:subject> <dc:subject>F2</dc:subject> <dc:format>GeoTIFF</dc:format> <dc:creator>Government of Canada; Natural Resources Canada; Earth Sciences Sector; Canada Centre for Mapping and Earth Observation </dc:creator> <dc:description>The Radarsat-1 satellite has a synthetic aperture radar(SAR) imaging instrument. The images are used internationally to manage and monitor the Earth's resources and to monitor global climate change, as well as in many other commercial and scientific applications. RADARSAT-1 is ideally suited to supporting these tasks because of its wide range of beams, SAR technology, frequent revisit period, high-quality products and fast, efficient delivery. Each of Radarsat-1's seven beam modes offer a different image resolution. The modes include Fine, which covers an area of 50 km × 50 km (31 mi × 31 mi) (2,500 km2 (970 sq mi)) with a resolution of 10 metres (33 ft); Standard, which covers an area of 100 km × 100 km (62 mi × 62 mi) (10,000 km2 (3,900 sq mi)) and has a resolution of 30 metres (98 ft); and ScanSAR wide, which covers a 500 km × 500 km (310 mi × 310 mi) (250,000 km2 (97,000 sq mi)) area with a resolution of 100 metres (330 ft). Radarsat-1 also has the unique ability to direct its beam at different angles. </dc:description> <dct:abstract>The Radarsat-1 satellite has a synthetic aperture radar(SAR) imaging instrument. The images are used internationally to manage and monitor the Earth's resources and to monitor global climate change, as well as in many other commercial and scientific applications. RADARSAT-1 is ideally suited to supporting these tasks because of its wide range of beams, SAR technology, frequent revisit period, high-quality products and fast, efficient delivery. Each of Radarsat-1's seven beam modes offer a different image resolution. The modes include Fine, which covers an area of 50 km × 50 km (31 mi × 31 mi) (2,500 km2 (970 sq mi)) with a resolution of 10 metres (33 ft); Standard, which covers an area of 100 km × 100 km (62 mi × 62 mi) (10,000 km2 (3,900 sq mi)) and has a resolution of 30 metres (98 ft); and ScanSAR wide, which covers a 500 km × 500 km (310 mi × 310 mi) (250,000 km2 (97,000 sq mi)) area with a resolution of 100 metres (330 ft). Radarsat-1 also has the unique ability to direct its beam at different angles. </dct:abstract> <dc:publisher>NRCan/CCMEO/EODMS section head</dc:publisher> <dc:date>2013-02-21</dc:date> <dc:language>eng; CAN</dc:language> <dct:references scheme="OVERVIEW"> https://was-eodms.compusult.net/wes/getObject? FeatureID=SERVICE-RSAT1_001ogc-000000000000000000client-1508208 &amp;ObjectType=Thumbview&amp;collectionId=Radarsat1 <py/dct:references> <dct:references scheme="THUMBVIEW"> https://was-eodms.compusult.net/wes/getObject? FeatureID=SERVICE-RSAT1_001-000000000000000000-1508208 &amp;ObjectType=Thumbview&amp;collectionId=Radarsat1 </dct:references> <dct:references scheme="transferOptions"> http://gs.mdacorporation.com/SatelliteData/ Radarsat1/Radarsat1.aspx </dct:references> <dct:references scheme="transferOptions"> http://ceocat.ccrs.nrcan.gc.ca </dct:references> <dc:wiki open source> https://www.eodms-sgdot.nrcan-rncan.gc.ca:80/MetaManagerCSW /csw/eodms_catalog?service=CSW&amp;request=GetRecordById &amp;version=2.0.2&amp;ElementSetName=full&amp;outputSchema=http:// www.isotc211.org/2005/gmd&amp;Id=1508208&amp;outputFormat=text/html </dc:source> <ows:BoundingBox> <ows:LowerCorner>-76.275153 45.191208</ows:LowerCorner> <ows:UpperCorner>-75.444661 45.739692</ows:UpperCorner> </ows:BoundingBox> </csw:Record> <csw:Record xmlns:csw="http://www.opengis.net/cat/csw/2.0.2" xmlns:ows="http://www.opengis.net/ows" xmlns:dct="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/"> . . . </csw:Record> . . . </SearchResults></GetRecordsResponse></pre> EXTRACT RECORD ID AND COLLECTION ID FROM RESPONSE Using the GetRecords HTTP response, the record ID and the collection ID can be extracted. The record ID is taken from <code><dc:identifier></code> in the response. The collection ID can be extracted by parsing the URL in the <code><dct:references></code>.The next step in the script is to convert the XML response into an ElementTree and get the XML element of the first record (or remove the '''<code style='color:blue'>break</code>''' and add each <code>rec_element</code> to a list to go through each record in the response): <pre style="background-color:#EEFFCC; border-color:#AACC99"># Get first record from the response XMLresp_xml = csw_r.contentroot = ElementTree.fromstring(resp_xml) record_tag = '{http://www.opengis.net/cat/csw/2.0.2}Record'for child in root.iter('*'): if child.find(record_tag): rec_element = child.find(record_tag) break</pre> Using the record element, locate the <code><dc:identifier></code> element and get its text: <pre style="background-color:#EEFFCC; border-color:#AACC99"># Get the ID of the first recordid_tag = '{http://purl.org/dc/elements/1.1/}identifier'id_el = rec_element.find(id_tag)rec_id = id_el.text</pre> Next, locate the <code><dct:references></code> in the record element and parse the URL from it: <pre style="background-color:#EEFFCC; border-color:#AACC99"># Parse the collection ID from the first dct:references linksref_tag = '{http://purl.org/dc/terms/}references'ref_el = rec_element.find(ref_tag)ref_url = ref_el.text url_parse = urlparse(ref_url)url_query = url_parse.queryquery_items = {u.split('=')[0]:u.split('=')[1] for u in url_query.split('&')}collection_id = query_items['collectionId'Python module on GitHub]</pre> ==== DescribeCoverage Request ==== The '''DescribeCoverage''' feature can be sent as a POST or GET request.  The URL for the '''DescribeCoverage''' GET request is:https://www.eodms-sgdot.nrcan-rncan.gc.ca/wes/services/WESOrder/wcs?SERVICE=WCS&version=2.0.1&REQUEST=DescribeCoverage&coverageId=1508208&CollectionId=Radarsat1 The POST request would be: <pre><?xml version="1.0" encoding="UTF-8"?><wcs:DescribeCoverage service="WCS" version="2.0.1" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation="http://www.opengis.net/wcs/2.0 http://schemas.opengis.net/wcs/2.0/wcsAll.xsd" xmlns="http://www.opengis.net/wcs/2.0" xmlns:wcs="http://www.opengis.net/wcs/2.0"> <wcs:CoverageId>Radarsat1--5117806</wcs:CoverageId></wcs:DescribeCoverage></pre> For the Python scripts, the GET URL will be used. The code for the '''DescribeCoverage''' GET URL is: <pre style="background-color:#EEFFCC; border-color:#AACC99"># Submit a DescribeCoverage GET request to search the WCS using the record EODMS_Catalog CSW and collection IDswcs_url = 'https://www.eodms-sgdot.nrcan-rncan.gc.ca/wes/services/WESOrder/' \ 'wcs?SERVICE=WCS&version=2.0.1&REQUEST=DescribeCoverage' \ '&coverageId=%s&CollectionId=%s' % (rec_id, collection_id)</pre> Using the WCS service requires a user account. To send an authenticated request in Python, a session containing the username and password has to be created first. The following code creates a session with username and password and then sends the GET request through the session: <pre style="background-color:#EEFFCC; border-color:#AACC99">username = '######'password = base64.b64decode("######").decode("utf-8") session = requests.Session()session.auth = (username, password)wcs_desccov = session.get(url=wcs_url)</pre> Next, the DescribeCoverage will send back the following response if the request was successful: <pre><wcs:CoverageDescriptions xmlns:wcs="http://www.opengis.net/wcs/2.0"> <wcs:CoverageDescription xmlns:gml="http://www.opengis.net/gml/3.2" gml:id="Cd5a023dc-0003-4ddf-b5cc-5d2e533eac05"> <wcs:CoverageId>Radarsat1--1508208</wcs:CoverageId> <metadata xmlns="http://www.opengis.net/gmlcov/1.0" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://www.eodms-sgdot.nrcan-rncan.gc.ca/wes /services/WESSearch/csw/Radarsat1?request=GetRecordById &Id=1508208&version=2.0.2&outputSchema=http://schema.compusult.net/ services/2.2.0/WESSearch/csw&service=CSW" xlink:title="CSW GetRecordById" xlink:type="simple"/> <gml:domainSet> <gml:Polygon xmlns:gml="http://www.opengis.net/gml/3.2" gml:id="C49b46f31-cbe9-433b-9201-d4f0cc04ee0d" srsDimension="2" srsName="EPSG:4326"> <gml:exterior> <gml:LinearRing> <gml:posList> -76.275153 45.652944 -76.157606 45.191208 -75.444661 45.278003 -75.556206 45.739692 -76.275153 45.652944 </gml:posList> </gml:LinearRing> </gml:exterior> </gml:Polygon> </gml:domainSet> <rangeType xmlns="http://www.opengis.net/gmlcov/1.0"/> <wcs:ServiceParameters> <wcs:CoverageSubtype>GridCoverage</wcs:CoverageSubtype> <wcs:nativeFormat/> <wcs:Extension> <DestinationTypes xmlns="http://schema.compusult.net/ services/2.7.0/WESOrder/wcs"> <Type>Download</Type> </DestinationTypes> <Parameter xmlns="http://schema.compusult.net/services/ 2.7.0/WESOrder"> <Name>packagingFormat</Name> <Title>Packaging Format</Title> <Description>Packaging Format</Description> <Default>ZIP</Default> <Choices> <Value>ZIP</Value> <Display>Zip</Display> <Description>Zip</Description> <DependentParameters/> </Choices> <Choices> <Value>TAR</Value> <Display>Tar</Display> <Description>Tar</Description> <DependentParameters/> </Choices> <Choices> <Value>TARGZ</Value> <Display>Tar/GZ</Display> <Description>Tar/GZ</Description> <DependentParameters/> </Choices> <Choices> <Value>TAR</Value> <Display>Tar</Display> <Description>Tar</Description> <DependentParameters/> </Choices> <Choices> <Value>TARGZ</Value> <Display>Tar/GZ</Display> <Description>Tar/GZ</Description> <DependentParameters/> </Choices> </Parameter> </wcs:Extension> </wcs:ServiceParameters> </wcs:CoverageDescription></wcs:CoverageDescriptions></pre> ==== GetCoverage Request ==== If the request was successful, the status code of 200 will be returned with the request and the '''GetCoverage''' operation can be sent to the WCS. A GET request similar to the DescribeCoverage can be sent to the WCS (adding <code>format=applicationgml+xml</code> to the URL query). In this case, order a POST request is used. For the POST request, the <code>CoverageId</code> must be in the format of <collection>--<record_id> so in this case the <code>CoverageId</code> is <code>Radarsat1Radarsat--1508208</code>: <pre style="background-color:#EEFFCC; border-color:#AACC99">if wcs_desccov.status_code == 200: cov_id = '%s--%s' % (collection_id, rec_id)  # Submit a GetCoverage to the WCS getcov_post = '''<wcs:GetCoverage xmlns:wos="http://schema.compusult.net/services/2.6.1/WESOrder" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation="http://www.opengis.net/wcs/2.0 http://schemas.opengis.net/wcs/2.0/wcsAll.xsd" xmlns="http://www.opengis.net/wcs/2.0" xmlns:wcs="http://www.opengis.net/wcs/2.0" xmlns:wes="http://schema.compusult.net/services/2.6.1/WESOrder/wcs" service="WCS" version="2.0.1"> <wcs:CoverageId>%s</wcs:CoverageId> <wcs:format>application/gml+xml</wcs:format></wcs:GetCoverage>''' % cov_id wcs_getcov = session.post(url=wcs_url, data=getcov_post)</pre> Once the request has been sent, the user will receive an “EODMS Image Request Submitted Notification” email letting them know that their request has been submitted. Shortly after receiving this email, the user should then receive another email called “EODMS Image Request Delivery Notification” with download links for the specific image. ==== Full Script ==== <pre style="background-color:#EEFFCC; border-color:#AACC99">import sysimport requestsfrom xml.etree import ElementTreeimport base64from urllib.parse import urlencodefrom urllib.parse import urlparse def main():  # Set specific parameters aoi = '-76.3556 44.9617 -75.2466 44.9617 -75.2466 45.5371 ' \ '-76.3556 45.5371 -76.3556 44.9617' lower_corner = '-76.3556 44.9617' upper_corner = '-75.2466 45.5371' end_date = '2013-03-29Z'  # Submit a GetRecords to the CSW post_xml = '''<?xml version="1.0" encoding="UTF-8"?><csw:GetRecords service='CSW' version='2.0EODMS.2' maxRecords='15' startPosition='1' resultType='results' outputFormat='application/xml' outputSchema='http://www.opengis.net/cat/csw/2.0.2' xmlns='http://www.opengis.net/cat/csw/2.0.2' xmlns:csw='http://www.opengis.net/cat/csw/2.0.2' xmlns:ogc='http://www.opengis.net/ogc' xmlns:ows='http://www.opengis.net/ows' xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:dct='http://purl.org/dc/terms/' xmlns:gml='http://www.opengis.net/gml' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd'> <csw:Query typeNames='csw:Record'> <csw:ElementSetName typeNames='csw:Record'>full</csw:ElementSetName> <csw:Constraint version="1.1.0"> <ogc:Filter> <ogc:And> <ogc:PropertyIsLessThan> <ogc:PropertyName>dc:date</ogc:PropertyName> <ogc:Literal>%s</ogc:Literal> </ogc:PropertyIsLessThan> <ogc:PropertyIsLike escapeChar='\\' singleChar='?' wildCard='*'> <ogc:PropertyName>dc:title</ogc:PropertyName> <ogc:Literal>*</ogc:Literal> </ogc:PropertyIsLike> <ogc:BBOX> <ogc:PropertyName>ows:BoundingBox</ogc:PropertyName> <gml:Envelope> <gml:lowerCorner>%s</gml:lowerCorner> <gml:upperCorner>%s</gml:upperCorner> </gml:Envelope> </ogc:BBOX> </ogc:And> </ogc:Filter> </csw:Constraint> </csw:Query></csw:GetRecords>''' % (end_date, lower_corner, upper_corner)  csw_url = 'https://www.eodms-sgdot.nrcan-rncan.gc.ca/MetaManagerCSW' \ '/csw/eodms_catalog' headers = {'Content-Type':'application/xml'} csw_r = requests.post(csw_url, data=post_xml) # Get first record from the response XML resp_xml = csw_r.content root = ElementTree.fromstring(resp_xml) record_tag = '{http://www.opengis.net/cat/csw/2.0.2}Record' for child in root.iter('*'): if child.find(record_tag): rec_element = child.find(record_tag) break # Get the ID of the first record id_tag = '{http://purl.org/dc/elements/1.1/}identifier' id_el = rec_element.find(id_tag) rec_id = id_el.text # Parse the collection ID from the first dct:references links ref_tag = '{http://purl.org/dc/terms/}references' ref_el = rec_element.find(ref_tag) ref_url = ref_el.text url_parse = urlparse(ref_url) url_query = url_parse.query query_items = {u.split('=')[0]:u.split('=')[1] \ for u in url_query.split('&')} collection_id = query_items['collectionId'] # Submit a DescribeCoverage GET request to the WCS using the record # and collection IDs wcs_url = 'https://www.eodms-sgdot.nrcan-rncan.gc.ca/wes/services/WESOrder/' \ 'wcs?SERVICE=WCS&version=2.0.1&REQUEST=DescribeCoverage' \ '&coverageId=%s&CollectionId=%s' % (rec_id, collection_id) # Create a session with authentication username = 'keballan' password = base64.b64decode("TWJWbUNoMTIj").decode("utf-8") session = requests.Session() session.auth = (username, password) wcs_desccov = session.get(url=wcs_url) if wcs_desccov.status_code == 200: cov_id = '%s--%s' % (collection_id, rec_id) # Submit a GetCoverage to the WCS getcov_post = '''<wcs:GetCoverage xmlns:wos="http://schema.compusult.net/services/2.6.1/WESOrder" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation="http://www.opengis.net/wcs/2.0 http://schemas.opengis.net/wcs/2.0/wcsAll.xsd" xmlns="http://www.opengis.net/wcs/2.0" xmlns:wcs="http://www.opengis.net/wcs/2.0" xmlns:wes="http://schema.compusult.net/services/2.6.1/WESOrder/wcs" service="WCS" version="2.0.1"> <wcs:CoverageId>%s</wcs:CoverageId> <wcs:format>application/gml+xml</wcs:format></wcs:GetCoverage>''' % cov_id  wcs_getcov = session.post(url=wcs_url, data=getcov_post) if __name__ == '__main__': sys.exit(main())</pre>
== Katalon ==
&#x09;</wcs:CoverageDescription>
</wcs:CoverageDescriptions></pre>
 
== == Exemple de commande de bout en bout (avec Python) ==
 
Découvrez notre [https://github.com/nrcan-eodms-sgdot-rncan/eodms-ogc-client-py/wiki module Python Open Source sur GitHub] pour rechercher les services EODMS_Catalog CSW et WCS afin de commander un Radarsat-1. image de l'EODMS.
== Katalon ==

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