https://www.javacodegeeks.com/xpath-tutorials

2020
https://www.baeldung.com/java-xpath
    https://github.com/eugenp/tutorials/tree/master/xml

samples
https://github.com/nwillc/vplugin/blob/master/src/main/kotlin/com/github/nwillc/vplugin/xmlExt.kt
https://github.com/nwillc/vplugin/blob/master/src/main/kotlin/com/github/nwillc/vplugin/latest.kt
https://github.com/nwillc/vplugin/blob/master/src/test/kotlin/com/github/nwillc/vplugin/XmlExtKTTest.kt