<?xml version='1.0'?><?xml-stylesheet href='/static/xsl/oai.xsl' type='text/xsl'?><ri:Resource created="2026-05-26T00:00:00Z" status="active" updated="2026-06-04T15:26:44Z" 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"><title>ZTF Cross-Catalog Matches</title><shortName>ztf.xmatch</shortName><identifier>ivo://x-unregistred/ztf/ztf_lowercase/xmatch</identifier><curation><publisher>ALeRCE (Automatic Learning for the Rapid Classification of Events)</publisher><creator><name>ALeRCE Team</name><logo>https://tap.alerce.online/favicon.png</logo></creator><date role="Updated">2026-06-10T02:31:00Z</date><contact><name>ALeRCE Team</name><address>Beauchef 851, Edificio Norte, piso 6. Santiago, Chile.</address><email>alerce.broker@gmail.com</email></contact></curation><content><subject>astronomy, objects</subject><subject>ZTF</subject><subject>transients</subject><subject>time-series</subject><description>
Cross-matches between ZTF objects and external astronomical catalogs,
including angular separation, catalog identifiers, and classification information.</description><referenceURL>http://tap.alerce.online/tableinfo/ztf.xmatch</referenceURL></content><tableset><schema><name>ztf</name><title>ALeRCE ZTF Legacy Catalog</title><description>
Legacy ZTF astronomical catalog containing objects, detections, photometric measurements,
classifications, and cross-matches from the Zwicky Transient Facility (ZTF) survey,
as processed by the ALeRCE broker pipeline.</description><table><name>ztf.xmatch</name><title>ZTF Cross-Catalog Matches</title><description>
Cross-matches between ZTF objects and external astronomical catalogs,
including angular separation, catalog identifiers, and classification information.</description><column><name>oid</name><description>ZTF object identifier</description><ucd>meta.id;src</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>indexed</flag><flag>primary</flag></column><column><name>catid</name><description>External catalog short identifier</description><ucd>meta.id;meta.table</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>indexed</flag><flag>primary</flag></column><column><name>oid_catalog</name><description>Source identifier in the external catalog</description><ucd>meta.id</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType></column><column><name>dist</name><description>Angular separation to the matched catalog source</description><unit>arcsec</unit><ucd>pos.angDistance</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>class_catalog</name><description>Classification from the external catalog (if available)</description><ucd>src.class</ucd><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>period</name><description>Period from the external catalog (if applicable)</description><unit>d</unit><ucd>time.period</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column></table></schema></tableset></ri:Resource>