How does XPath deal with XML namespaces?

Question

How does XPath deal with XML namespaces?

If I use

/IntuitResponse/QueryResponse/Bill/Id

to parse the XML document

Answer 1

I use /*[name()='...'] in a google sheet to fetch some counts from Wikidata. I have a table like this

 thes    WD prop links   items
 NOM     P7749   3925    3789
 AAT     P1014   21157   20224

and the formulas in cols links and items are

=IMPORTXML("https://query.wikidata.org/sparql?query=SELECT(COUNT(*)as?c){?item wdt:"&$B14&"[]}","//*[name()='literal']")
=IMPORTXML("https://query.wikidata.org/sparql?query=SELECT(COUNT(distinct?item)as?c){?item wdt:"&$B14&"[]}","//*[name()='literal']")

respectively. The SPARQL query happens not to have any spaces...

I saw name() used instead of local-name() in Xml Namespace breaking my xpath!, and for some reason //*:literal doesn't work.