Instead to find where org.w3c.dom comes from I've been using this script:
mvn dependency:copy-dependencies -DincludeScope=test -DoutputDirectory=deps
for i in deps/*.jar; do if unzip -l $i| grep -q org.w3c.dom; then echo $i; fi ; done
M. Mikkola, and W. Schnobrich. Structural Research Series No.367. University of Illinois Engineering Experiment Station. College of
Engineering, University of Illinois at Urbana-Champaign, (August 1970)
F. Hand, D. Pecknold, and W. Schnobrich. Structural Research Series No.389. University of Illinois Engineering Experiment Station. College of
Engineering, University of Illinois at Urbana-Champaign, (August 1972)