SQL Server 2012 - cannot Import XML with xmlns into table - sql-server

Question

I'm trying to import some nodes into a sql server table from an xml file with ns
<?xml version="1.0" encoding="UTF-8"?>
<GetSellerTransactionsResponse xmlns="urn:ebay:apis:eBLBaseComponents">
<Timestamp>2019-08-03T17:51:45.081Z</Timestamp>
...
</GetSellerTransactionsResponse>
with this query:
DECLARE #XML AS XML, #hDoc AS INT, #SQL NVARCHAR (MAX)
SELECT #XML = XMLData FROM XMLwithOpenXML
EXEC sp_xml_preparedocument #hDoc OUTPUT, #XML
;WITH XMLNAMESPACES (DEFAULT 'urn:ebay:apis:eBLBaseComponents' )
insert into Users (EIASToken,Email, UserID,RegistrationDate)
SELECT distinct EIASToken,Email, UserID,RegistrationDate
FROM OPENXML(#hDoc, 'GetSellerTransactionsResponse/TransactionArray/Transaction/Buyer')
WITH
(
EiasToken[nvarchar](100) 'EIASToken',
Email[nvarchar](100) 'Email',
UserID [nvarchar](100) 'UserID',
RegistrationDate [datetime] 'RegistrationDate',
Name [nvarchar] (100) 'BuyerInfo/ShippingAddress/Name'
)
where EIASToken not in (select EIASToken from Users)
EXEC sp_xml_removedocument #hDoc
I solved in this way, creating a name for xmlns (ebl) and adding #xmlns as third parameter to sp_xml_preparedocument and then adding ebl: to all nodes and subnodes and removing the ;WITH XMLNAMESPACES statement:
SET #xmlns = '<GetSellerTransactionsResponse xmlns:ebl="urn:ebay:apis:eBLBaseComponents" />'
SELECT #XML = XMLData FROM XMLwithOpenXML
EXEC sp_xml_preparedocument #hDoc OUTPUT, #XML, #xmlns
insert into Users (EIASToken,Email, UserID,RegistrationDate,Name)
SELECT distinct EIASToken,Email, UserID,RegistrationDate,Name
FROM OPENXML(#hDoc, 'ebl:GetSellerTransactionsResponse/ebl:TransactionArray/ebl:Transaction/ebl:Buyer')
WITH
(
EiasToken[nvarchar](100) 'ebl:EIASToken',
Email[nvarchar](100) 'ebl:Email',
UserID [nvarchar](100) 'ebl:UserID',
RegistrationDate [datetime] 'ebl:RegistrationDate',
Name [nvarchar] (100) 'ebl:BuyerInfo/ebl:ShippingAddress/ebl:Name'
)
where EIASToken not in (select EIASToken from Users)
but I'm quite sure there's a way to avoid all that ebl:
can somebody suggest the solution?
Thanks
-----------------
Following the suggestion of marc_s I tried to build the queries with XQuery (actually not using #XML.query)
;WITH XMLNAMESPACES (DEFAULT 'urn:ebay:apis:eBLBaseComponents' )
INSERT INTO dbo.Sales
(...)
SELECT
...
FROM #XML.nodes('//OrderArray/Order/TransactionArray/Transaction') as O(X)
and
;WITH XMLNAMESPACES (DEFAULT 'urn:ebay:apis:eBLBaseComponents' )
INSERT INTO dbo.Sales
(...)
SELECT
...
FROM #XML.nodes('//OrderArray/Order') as O(X)
CROSS APPLY O.X.nodes('//TransactionArray/Transaction') as I(X)
WHERE O.X.value('(TransactionArray/Transaction/TransactionID/text())[1]', 'nvarchar(70)')=I.X.value('(TransactionID/text())[1]', 'nvarchar(70)')
Firsts solution returned the same number of records, while second is missing some 10%.
But biggest issue is on performances:
Parsing the same 12MB XML with 1237 "Records" I got the following results:
OPENXML
(1237 rows affected)
SQL Server Execution Times:
CPU time = 687 ms, elapsed time = 986 ms.
-
XQuery without Cross Apply
(1237 rows affected)
SQL Server Execution Times:
CPU time = 14.106.641 ms, elapsed time = 7.788.378 ms.
-
XQuery with Cross Apply
(1134 rows affected)
SQL Server Execution Times:
CPU time = 1.661.968 ms, elapsed time = 1.668.166 ms.
Therefore the OPENXML Solution is the only one reasonable, or have I made some mistakes or should use #XML.query() ?