[Xml-compile] Beginner's question: Using XML::eXistDB::RPC with XQuery

[Mark Overmeer]

* Mirco Hilbert (Mirco.Hilbert at germanistik.uni-giessen.de) [100617 10:08]:
> I started testing your Perl module XML::eXistDB sending XQuery
> requests to an eXist database on my local host.

> The first message I run into is the following warning (but, apparently,
> I can ignore it):
>> Prototype mismatch: sub XML::Compile::RPC::Client::trace (@) vs () at /usr/local/share/perl/5.10.0/XML/Compile/RPC/Client.pm line 54.
>> Subroutine trace redefined at /usr/local/share/perl/5.10.0/XML/Compile/RPC/Client.pm line 54.


Hum... there was still a version XML::Compile::RPC 0.15 waiting in the
queue to be released (Just did it)  It is caused by a change in Log::Report.
Change in XML::Compile::RPC::Client

  + use Log::Report              'xml-compile-rpc';
  + use Log::Report              'xml-compile-rpc', syntax => 'LONG';

It is a warning.

> The result I get here in @data is a nested hash structure.
> But I wonder if there is a possibility to get the result as an
> XML::LibXML::Document or XML::LibXML::Element object?

My idea behind the module is to connect pure Perl space with ExistDB.
I strongly prefer to use   my ($rc, $info) = $db->describeUser($user);
than to manually construct XML nodes first. And when the call parameters
are plain Perl, the returned data should be that as well...

> Is there such a possibility which I maybe have overlooked reading the
> documentation? Maybe using the FORMAT parameter of retrieveResults?

The FORMAT is part of the query: how eXist must produce the document.
It does not describe how XML::eXistDB should handle it; which is
regulated by parameters to new() or the methods at stake.

Your idea for extension is not too bad... probably, a few selective
methods should be influencable, for instance retrieveResults().
  my ($rc, $hash) = $db->retrieveResults($set, decode => 1);
  my ($rc, $xml)  = $db->retrieveResults($set, decode => 0);
(very unsure on the 'decode' name)

Not hard to implement.  Which methods should be configurable to return
XML and how do we use them?
-- 
Regards,
               MarkOv

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       Mark Overmeer MSc                                MARKOV Solutions
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