[xml] question about how to set namespace in libxml

[Dan Quach <daniel shinzu com>]

Currently I am reading in the following xml document (through a ruby wrapper)

LibXML::XML::Document.string( saml_plain)

<ds:SignedInfo>

<ds:CanonicalizationMethod Algorithm='http://www.w3.org/2001/10/xml-exc-c14n#'/>

<ds:SignatureMethod Algorithm='http://www.w3.org/2000/09/xmldsig#rsa-sha1'/>

<ds:Reference URI='#FYQBldG6i_i18gy6gJfhOh7.u_T'>

<ds:Transforms>

<ds:Transform Algorithm='http://www.w3.org/2000/09/xmldsig#enveloped-signature'/>

<ds:Transform Algorithm='http://www.w3.org/2001/10/xml-exc-c14n#'/>

</ds:Transforms>

<ds:DigestMethod Algorithm='http://www.w3.org/2000/09/xmldsig#sha1'/>

<ds:DigestValue>KpuhfX2q6nR660VW/dS0vIrVtSg=</ds:DigestValue>

</ds:Reference>

</ds:SignedInfo>

The problem when it is read in that all of the ds namespaces are stripped and errors occur

<SignedInfo>

<CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></CanonicalizationMethod>

<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"></SignatureMethod>

<Reference URI="#FYQBldG6i_i18gy6gJfhOh7.u_T">

<Transforms>

<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"></Transform>

<Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"></Transform>

</Transforms>

<DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"></DigestMethod>

<DigestValue>KpuhfX2q6nR660VW/dS0vIrVtSg=</DigestValue>

</Reference>

</SignedInfo>

Is there a way I can set the 'ds' namespace as 'http://www.w3.org/2000/09/xmldsig#' so it would be read in as:

<ds:SignedInfo xmlns:ds="http://www.w3.org/2000/09/xmldig#">

<ds:CanonicalizationMethod Algorithm='http://www.w3.org/2001/10/xml-exc-c14n#'/>

<ds:SignatureMethod Algorithm='http://www.w3.org/2000/09/xmldsig#rsa-sha1'/>

<ds:Reference URI='#FYQBldG6i_i18gy6gJfhOh7.u_T'>

<ds:Transforms>

<ds:Transform Algorithm='http://www.w3.org/2000/09/xmldsig#enveloped-signature'/>

<ds:Transform Algorithm='http://www.w3.org/2001/10/xml-exc-c14n#'/>

</ds:Transforms>

<ds:DigestMethod Algorithm='http://www.w3.org/2000/09/xmldsig#sha1'/>

<ds:DigestValue>KpuhfX2q6nR660VW/dS0vIrVtSg=</ds:DigestValue>

</ds:Reference>

</ds:SignedInfo>

thanks!

-dan