Removing namespaces and elements

[taq]

Hi!

Thanks for this gem. I'm using it to sign some XML files here, but our local government has some custom and strict rules for the documents. I'm using this code:

signer  = Signer.new(data)
signer.cert = OpenSSL::X509::Certificate.new(File.read(files[:cert]))
signer.private_key  = OpenSSL::PKey::RSA.new(File.read(files[:key]), File.read(files[:pwd]).chomp)
signer.security_node  = signer.document.root
signer.security_token_id = ""
signer.digest!(signer.document.root, :id => "id", :enveloped => true)
signer.sign!(:issuer_serial => true)
signer.to_xml

And I'd like to check if is possible to:

1. Remove namespaces. I need xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="id" be removed from the main element. They just want their custom namespace.

2. Remove some elements. To conform to their XSD, I need to remove the elements <X509SubjectName>, <X509IssuerSerial>, <KeyValue>, <RSAKeyValue>, <Modulus> and <Exponent>.

3. Change reference URI. To conform to their XSD, I need to replace the "#id" on Reference URI="#id" to a custom one.

4. Insert new elements. I need to insert <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/> before `</Transforms>' ends.

5. Remove new lines. They won't allow a new line after <?xml version="1.0"?>, I need the signed result to don't use newline character. I could remove on the result, but seems the sign would be invalid if it was there when signing.

Thanks!