Will adjust the XML language as follow: This specification defines the following method for canonicalizing FHIR resources, when represented as XML: Each XML instance or fragment that is part of the collection being signed SHALL Contain no white-space other than single spaces in attribute values and in the XHTML in the  Narrative Use default namespaces for the FHIR and XHTML namespaces Omit all comments Always use the Unicode character representation for any XML entities (e.g.  '  instead of  " ) Include the XML processing instruction  <?xml version="1.0" encoding="UTF-8"?> Using the XML canonical method  Canonical XML 1.1   ( http://www.w3.org/2006/12/xml-c14n11 )   Will change the JSON as follows: This specification defines the following method for canonicalizing FHIR resources, when represented as JSON: The signed set of fragments SHALL be transformed such that: No whitespace is included other than single spaces in property values and in the xhtml in the  Narrative Properties are ordered alphabetically within each object Multiple fragments are concatenated with no intervening white-space in the order defined by the element with the Signature data type.