I am trying to convert a nessus file to a more useful report, something like this: Severity, Finding, Hosts, Associated CVEs Critical, RHSA-2012-0465: libsmbclient, (ip1, ip2), CVE-20xx-yyyy Query: for $x in //Report/ReportHost/ReportItem let $finding := string-join(data($x/cve),", ") where $x/risk_factor = "Critical" group by $finding order by $finding return for $x in //Report/ReportHost/ReportItem let $finding1 := string-join(data($x/cve),", ") let $host := data($x/../@name) where $finding1=$finding group by $finding1 order by $finding1 return <finding> <cve>{$finding1}</cve> <host>{$host}</host> </finding> Error: Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk@mailman.uni-konstanz.de Version: BaseX 7.2.1 Java: Oracle Corporation, 1.7.0 OS: Windows 7, amd64 Stack Trace: java.lang.ClassCastException: org.basex.query.item.DBNodeSeq cannot be cast to org.basex.query.item.ANode org.basex.query.path.AxisPath.iter(AxisPath.java:273) org.basex.query.QueryContext.iter(QueryContext.java:275) org.basex.query.flwor.For$1.init(For.java:120) org.basex.query.flwor.For$1.next(For.java:84) org.basex.query.flwor.GFLWOR.iter(GFLWOR.java:320) org.basex.query.flwor.GFLWOR.iter(GFLWOR.java:295) org.basex.query.QueryContext.iter(QueryContext.java:275) org.basex.query.expr.ParseExpr.value(ParseExpr.java:69) org.basex.query.QueryContext.value(QueryContext.java:286) org.basex.query.flwor.Order.add(Order.java:76) org.basex.query.flwor.GroupPartition.ret(GroupPartition.java:148) org.basex.query.flwor.GFLWOR.iter(GFLWOR.java:302) org.basex.query.QueryContext.iter(QueryContext.java:275) org.basex.query.QueryContext.iter(QueryContext.java:229) org.basex.query.QueryContext.execute(QueryContext.java:448) org.basex.query.QueryProcessor.execute(QueryProcessor.java:94) org.basex.core.cmd.AQuery.query(AQuery.java:86) org.basex.core.cmd.XQuery.run(XQuery.java:22) org.basex.core.Command.run(Command.java:325) org.basex.core.Command.exec(Command.java:304) org.basex.core.Command.execute(Command.java:76) org.basex.gui.GUI.exec(GUI.java:390) org.basex.gui.GUI$6.run(GUI.java:342) v/r, David Brown Fully Qualified Navy Certification Agent LSS Certified Blackbelt, CISSP, NSA-IAM/IEM, MSCIS SPAWARSYSCEN ATLANTIC ISS LOB SSC Lead Email: <mailto:david.k.brown1@navy.mil> david.k.brown1@navy.mil Phone: 843.218.6227 DSN: 588.6227 Fax: 843.218.5461 "Let us not look back in anger or forward in fear, but around in awareness." James Thurber