What is the current JNLP specification (version) for OpenWebStart (Java SE 11)?
There is an inofficial JNLP version list here, but only up to Java SE 8.
Should still the DTD from Oracle/ Sun be used?
<!DOCTYPE jnlp PUBLIC "-//Sun Microsystems, Inc//DTD JNLP Descriptor 6.0//EN" "http://java.sun.com/dtd/JNLP-6.0.dtd">
Or is there a newer version? Or even an official XSD?
At the moment OpenWebStart supports the definition / DTD. As far as I know there is only one difference: OpenWebStart supports a vendor attribute in the j2se tag. This attribute can be used to define a specific JDK/runtime vendor that should be used to start the application.