Hi Christian,
               I have tested below code but it is not working. 

System.setProperty("org.basex.DEFAULTDB", "true");
XQDataSource xqs = new BaseXXQDataSource();

and xquery is: 
String xQuery = "for $article in doc('6301904f80000114/0601904f80007547.xml') return $article"; 
it is not working. 
Thanks,
Srikumar
From: Christian Grün <christian.gruen@gmail.com>
Sent: Tuesday, August 18, 2020 10:09 PM
To: Srikumar Choudhury <schoudhu@opentext.com>
Cc: basex-talk@mailman.uni-konstanz.de <basex-talk@mailman.uni-konstanz.de>; Nikhil Sethi <nsethi@opentext.com>
Subject: Re: [EXTERNAL] - Re: Error: Stopped at ., 1/20: [FODC0002] Resource 'C:/Srikumar/Software/BaseX/BaseX941/basex/bin/6301904f80000114/0601904f80007547.xml' does not exist.
 
> I have tried with below code, but it did not work.
> Is it correct to way to set this option?? Is there any other way to set DEFAULTDB?
>
>     XQDataSource xqs = new BaseXXQDataSource();
>     ...
>     System.setProperty("DEFAULTDB", "true");

The property key needs to be prefixed with 'org.basex.', and I would
recommend you to set this property as early as possible (i.e., before
the BaseXXQDataSource instance is created). See [1] for more
information on how to set options with BaseX.

I remember there also was a way to set options via XQJ, but I can’t
tell you off-hand how the corresponding method was called.

[1] https://urldefense.com/v3/__https://docs.basex.org/wiki/Options__;!!Obbck6kTJA!O4cMf2VcQVu4YyL-_HpxDhx_KAm2lWtNrYfU7nLJiJP6ir0P-uaPvOaiKR7XHreUaA$