a question regarding section "http://www.w3.org/TR/xmlenc-core/#sec-Serializing-XML"

Hi,
I am reading the section of 4.3.3 Serializing XML (Non-normative) (http://www.w3.org/TR/xmlenc-core/#sec-Serializing-XML).  I have a question regarding the canonicalization of empty default name space (xml="").   According to the  §3.4 Specification of Exclusive XML Canonicalization( http://www.w3.org/TR/xml-exc-c14n/#sec-Specification) and §4.7 Propagation of Default Namespace Declaration in Document Subsets <http://www.w3.org/TR/2001/REC-xml-c14n-20010315> [XML-C14N].), it seems that the output of canonicalization of 
<Document xmlns="http://example.org/">
 <ToBeEncrypted xmlns="" /> 
</Document>
should already include the xmlns="" as follows:
<Document xmlns="http://example.org/">
 <ToBeEncrypted xmlns=""><ToBeEncrypted> 
</Document>
I'd appreciate if  you guys could review and correct me if I am wrong.
Thanks,
Ignatius Feng

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