Postgres use xpath_table parsing with xmlnamespaces - postgresql

Question

Can I use xpath_table parsing with xmlnamespaces
drop table if exists _xml;
create temporary table _xml (fbf_xml_id serial,str_Xml xml);
insert into _xml(str_Xml)
select '<DataSet1 xmlns="http://tempuri.org/DataSet_LocalMaMC.xsd">
<Stations>
<ID>5</ID>
</Stations>
<Stations>
<ID>1</ID>
</Stations>
<Stations>
<ID>2</ID>
</Stations>
<Stations>
<ID>10</ID>
</Stations>
<Stations>
<ID/>
</Stations>
</DataSet1>' ;
drop table if exists _y;
create temporary table _y as
SELECT *
FROM xpath_table('FBF_xml_id','str_Xml','_xml',
'/DataSet1/Stations/ID',
'true') AS t(FBF_xml_id int,ID text);
select * from _y
If I take of the xmlnamespaces it works fine.
I thought to work with Xpath, but when there is null, it gives me wrong results.

Answer 1

With Postgres 10 or later, xmltable() is the preferred way to do this.
You can easily specify a list of namespaces with that.
SELECT fbf_xml_id, xt.id
FROM _xml
cross join
xmltable(xmlnamespaces ('http://tempuri.org/DataSet_LocalMaMC.xsd' as x),
'/x:DataSet1/x:Stations'
passing str_xml
columns
id text path 'x:ID') as xt
Note that in the XPath expression used for the xmltable() function, the tags are prefixed with the namespace alias defined in the xmlnamespaces option even though they are not prefixed in the input XML.
Online example