tag0 namespace added for elements in default namespace

You can construct the XmlSlurper with no namespace awareness like so:

import groovy.xml.XmlUtildef pom = new XmlSlurper( false, false ).parse( 'pom.xml' )println XmlUtil.serialize(pom)

Which should give you the answer you want... No idea currently about how to maintain comments during the slurp/serialize cycle :-(

As you say, it might be possible with XmlParser, but my current attempts have failed :-( There's some code here which might get you close, but as yet I've had no success :-(

I had the same issue with "tag0" getting added to elements that didn't define a namespace (i.e they were in the "no namespace" namespace). I fixed this by adding

declareNamespace('': '')

which resets elements from being in the default namespace to being in the "no namespace" namespace.

I found that it is better to use XmlParser rather than XmlSlurper if you are dealing with namespaces and having the tag0 problem. Syntactically they seem the same, eg:

def root = new XmlParser().parse(new File('example.xml'))println XmlUtil.serialize(root)

The above code would output the example.xml exactly as it should be including namespaces.

If you want to process the root in some way, eg find a specific node, use the Groovy API and output the result, eg

def root = new XmlParser().parse(new File('example.xml')def result = root."ns:Element"[0]println XmlUtil.serialize(result)