/usr/bin/saxonb-xquery is in libsaxonb-java 9.1.0.8+dfsg-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
exec java -classpath /usr/share/java/saxonb.jar net.sf.saxon.Query "$@"
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