Digital XML Signature with Certificate Chain

Hi!

I'm trying to validate a XML with a detached signature. There a certificate chain, like you can see in the example, and i have in my server a keystore with the certificates. Well, my qestion is how can i validate the certificate chain, and also the signature of the xml? Anyone have an example for me? I let you with the XML.

<?xml version="1.0" encoding="UTF-8" ?>
- -
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(...)

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-

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9BoB5VASWdKHLbG0I81B7UwDU/k=

(...)SignatureValue>
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-

(...)X509Certificate>
(...)X509Certificate>
(...)X509Certificate>

Let me know if you have any question about that... This is driving me crazy!

Thanks a lot for your help!

Cristovao