<?xml version='1.0'?><?xml-stylesheet href='/static/xsl/oai.xsl' type='text/xsl'?><ri:Resource created="2009-12-01T10:00:00Z" status="active" updated="2022-02-18T11:02:28Z" xmlns:g-colstat="http://dc.g-vo.org/ColStats-1" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://dc.g-vo.org/ColStats-1 http://vo.ari.uni-heidelberg.de/docs/schemata/Colstats.xsd http://www.ivoa.net/xml/RegistryInterface/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/RegistryInterface.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogResource"><identifier>ivo://OCA/__system__/tap/key_columns</identifier><curation><publisher>Observatoire de la Côte d'Azur</publisher><creator><name>Observatoire de la Côte d'Azur</name><logo>https://dachs.oca.eu/favicon.png</logo></creator><date role="updated">2025-10-15T14:46:35Z</date><contact><name>Guillaume Verbiese</name><address>Observatoire de la Côte d'Azur, Boulevard de l'Observatoire, CS 34229,
06304 Nice Cedex 4, France</address><email>guillaume.verbiese@oca.eu</email></contact></curation><content><subject>virtual-observatories</subject><subject>catalogs</subject><description>Columns participating in foreign key relationships between tables
available for ADQL querying.</description><referenceURL>https://dachs.oca.eu/tableinfo/tap_schema.key_columns</referenceURL></content><tableset><schema><name>tap_schema</name><description> OCA Data Center's Table Access Protocol (TAP) service with
table metadata.</description><table><name>tap_schema.key_columns</name><description>Columns participating in foreign key relationships between tables
available for ADQL querying.</description><column><name>key_id</name><description>Key identifier from TAP_SCHEMA.keys</description><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>from_column</name><description>Key column name in the from table</description><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>target_column</name><description>Key column in the target table</description><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>sourcerd</name><description>Id of the originating rd (local information)</description><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column></table></schema></tableset></ri:Resource>