modify EIS file recognition to allow varying header appearance and encoding
update EFM required-element validation to accommodate inline documents
UTR validation, accommodate missing measures (possibly due to
schema invalid qnames)
add html files meta tag with charset to accommodate nonASCII
characters in files (table linkbase output, all saved html file
outputs, etc)

add xmlcharrefreplace option to XmlUtil.writexml (to &#xxx; replace
nonASCII characters when appropriate)
specify exception to raise when prefix missing on xml qname
data type values