The W3C XML Security Specifications Maintenance Working Group
has posted the Proposed Edited Recommendation of 
XML Signature Syntax and Processing (Second Edition)
"This Proposed Second Edition of XML Signature Syntax and
    Processing adds Canonical XML 1.1 as a required
    canonicalization algorithm and recommends its use for inclusive
    canonicalization. This version of Canonical XML enables use of
    xml:id and xml:base Recommendations
    with XML Signature and also enables other possible future
    attributes in the XML namespace. Additional minor changes,
    including the incorporation of known errata, are documented in
    Changes in XML Signature Syntax and Processing
    (Second Edition)." I have to read through the detailed changes, but at first glance this looks like a reasonable adjustment that doesn't break any existing code.