Read xml nodes

Hello to everyone.
I 'm trying to build an rss reader in PLSQL.
I'm confused and i want your help.
I used dbms_xmlparser to parse an xml and read its nodes but I have a problem with the character set (xml is iso-8859-7 but i cannot read it).
So, i thought that if i made a request to the xml url using UTL_HTTP and GET method, then i could use clob response and from that to extract the nodes using EXTRACTVALUE function etc and all these in UTF-8
Here is a sample of the xml:
<item>
<title>ΝΔ: «Κρυφή ατζέντα» του ΠΑΣΟΚ για τη φορολογία</title>
<guid isPermaLink="true">http://www.naftemporiki.gr/news/rssredir.asp?id=1720858</guid>
<link>http://www.naftemporiki.gr/news/rssredir.asp?id=1720858</link>
<pubDate>Mon, 28 Sep 2009 15:45:00 +0200</pubDate>
<description>Για «κρυφή ατζέντα» στο πεδίο της φορολογίας κατηγορεί το ΠΑΣΟΚ και τον πρόεδρό του Γιώργο Παπανδρέου η ΝΔ, επισημαίνοντας ότι επιμένει να μην ανοίγει τα χαρτιά του, γίνεται όλο και πιο αόριστο και σχεδιάζει καινούργιους φόρους.</description>
<author>[email protected] (Η ΝΑΥΤΕΜΠΟΡΙΚΗ ON LINE)</author>
</item>
<item>
<title>Ομιλία Αλ. Τσίπρα στην πλατεία Κοτζιά αύριο</title>
<guid isPermaLink="true">http://www.naftemporiki.gr/news/rssredir.asp?id=1720857</guid>
<link>http://www.naftemporiki.gr/news/rssredir.asp?id=1720857</link>
<pubDate>Mon, 28 Sep 2009 15:44:00 +0200</pubDate>
<description> Την Τρίτη 29 Σεπτεμβρίου στην πλ. Κοτζιά, στις 7 μ.μ., θα πραγματοποιηθεί η κεντρική προεκλογική συγκέντρωση του ΣΥΡΙΖΑ στην Αθήνα με ομιλητή τον Πρόεδρο του ΣΥΝ Αλέξη Τσίπρα. </description>
<author>[email protected] (Η ΝΑΥΤΕΜΠΟΡΙΚΗ ON LINE)</author>
</item>
I'd like to loop through these nodes and take only the first 3 of them (eg first 3 "title"), not all the nodes.
Is there any suggestion either for the encoding or for the loop through the nodes...?
Thank you
Edited by: Alexandra T. on 28 Σεπ 2009 7:09 πμ

Just some quick thoughts.
You could use [.getXML|http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28419/t_dburi.htm#i1011991] of HTTPURITYPE to retrieve the remote XML as XML (or getClob if you want/need to bring it back as a CLOB).
For pulling the first three, two options are to have the data as an XML Type and setup a for 1..3 loop and do an extract where the XPath contains the loop counter in it, such as item[1]/title, item[2]/title, item[3]/title. Of you could not worry about the loop and just hard-code those three extracts into your code.
I've never had to deal with different character sets when dealing with XML so I can't offer much advice other than to search oracle sites for that info. (hint: via Google use site:forums.oracle.com and site:oracle.com).
Update: And then I run across this while reading some other forums {thread:id=613170}. Pay attention to the use of NLS_CHARSET_ID.
Edited by: A_Non on Sep 28, 2009 9:22 AM

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