How to find all XML elements by tag name in Groovy?

Question

How I can find all elements in XML by their tag name in Groovy (GPath)?

I need to find all car elements in this document:

Answer 1

This is how it works:

def xml = new XmlSlurper().parse(file)
def cars = xml.depthFirst().findAll { it.name() == 'car' }
assert cars.size() == 2