JMeter: # notation (for xml) - groovy

Question

On groovy templates for jmeter page there is an example I wanted to follow:
String xml = “
<actions>
<action type=”error” info=”itsErrors”/>
<action type="warning" info=”warnWarn”/>
<action type=”info” info=”justLogInfo”/>
</actions>"
XmlParser parser = new XmlParser()
def actions= parser.parseText (xml)
actions.action.each { action ->
println "${action.'#type'}: ${action.'#info'}";
}
At least in my JMeter 5.1 it did not work as posted, but when I fixed quotation marks it did:
String xml = """
<actions>
<action type="error" info="itsErrors"/>
<action type="warning" info="warnWarn"/>
<action type="info" info="justLogInfo"/>
</actions>"""
XmlParser parser = new XmlParser()
def actions= parser.parseText (xml)
actions.action.each { action ->
println "${action.'#type'}: ${action.'#info'}";
}
My question is usage of # mainly, dot and quotes too (.'#type'). I tried web search for Groovy # and found nothing, for JMeter notations found https://jmeter.apache.org/usermanual/functions.html with only one instance of usage:
Example: ${__XPath(/path/to/build.xml, //target/#name)} This will
match all targets in build.xml and return the contents of the next
name attribute
And about variables same link:
Referencing a variable in a test element is done by bracketing the
variable name with '${' and '}'.
Groovy docs page for xml gives other notations:
https://groovy-lang.org/processing-xml.html
def text = '''
<list>
<technology>
<name>Groovy</name>
</technology>
</list>
'''
def list = new XmlParser().parseText(text)
assert list instanceof groovy.util.Node
assert list.technology.name.text() == 'Groovy'
What each notation in "${action.'#type'}: ${action.'#info'}" means?
It isn't a JMeter variable even with ${}, is it?
I managed to keep in working only w/put ', other parts seems necessary: ", ., #, {}, $. I may have put extra in last phrase, some I can explain, but just to be sure I understand it right.

Answer 1

It's GPath syntax used in groovy
The most common way of querying XML in Groovy is using GPath
For XML, you can also specify attributes, e.g.:
a["#href"] → the href attribute of all the a elements
a.'#href' → an alternative way of expressing this
a.#href → an alternative way of expressing this when using XmlSlurper