<diagnostics>
    <diagnostic xmlns="http://www.loc.gov/zing/srw/diagnostic/">
        <uri>info:srw/diagnostic/1/123</uri>
        <details>
            <url>http://sru2.visual-library.de/sbt_ansel?operation=searchRetrieve&amp;query=rec.identifier%3D12345&amp;recordSchema=mods</url>
            <headers><header name="ACCEPT" value="*/*"/><header name="ACCEPT-ENCODING" value="gzip, br, zstd, deflate"/><header name="CONNECTION" value="Keep-Alive"/><header name="COOKIE" value="session_id=7b670ea72d8ec23810958058c8d9c4d4a308f7fd"/><header name="HOST" value="sru2.visual-library.de"/><header name="Remote-Addr" value="192.168.1.13"/><header name="USER-AGENT" value="Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"/><header name="X-FORWARDED-FOR" value="216.73.216.81"/><header name="X-FORWARDED-HOST" value="sru2.visual-library.de"/><header name="X-FORWARDED-SERVER" value="sru2.visual-library.de"/></headers>
            <params><param name="operation" value="searchRetrieve"/><param name="query" value="rec.identifier=12345"/><param name="recordSchema" value="mods"/></params>
            <additional><name>FetchFromZ3950Failed</name><hint>Failed to fetch data from underlying Z3950 interface</hint><msg>error during search</msg><exception>Bib1Err: Bib1Err: 123 Unsupported attribute combination 
</exception><cql>rec.identifier=12345</cql><pqf>@attr 1=12 "12345" </pqf><provider>sbt_ansel</provider><protocol>Z39.50</protocol><mdrevision>0</mdrevision><host>aleph.sbt.ti.ch</host><port>9991</port><database>SBT_ANSEL</database><encoding>ansel</encoding><recordSyntax>USMARC</recordSyntax><targetRecordSyntax>MODS</targetRecordSyntax><area>searchRetrieve.fetchRecords</area></additional>
            </details>
        <message>An error has occured: FetchFromZ3950Failed - error during search [Bib1Err: Bib1Err: 123 Unsupported attribute combination 
]</message>
    </diagnostic>
</diagnostics>