Running "xmllint" to validate broker.xml against "artemis-configuration.xsd" fails with following message:

xmllint --schema /schema/artemis-configuration.xsd broker.xml --noout

returns:

broker.xml:19: element configuration: Schemas validity error : Element '

configuration': No matching global declaration available for the validation root.
broker.xml fails to validate

The problem seems to be the element "configuration" not defined in the schema.
Removing the "configuration" element from the xml to be validated does the trick, trough the two command:

xmllint --xpath "/[local-name()='configuration']/[local-name()='core']" broker.xml > test.xml

This selects all elements inside "configuration", then I did

xmllint --schema schema/artemis-configuration.xsd test.xml --noout
test.xml validates