I'm transforming EPUB2 files to xhtml5 for EPUB3. Here's the beginning of one of the EPUB2 files. <?xml version='1.0' encoding='utf-8'?> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Personal Knowledge: Towards a Post-Critical Philosophy</title> <meta content="http://www.w3.org/1999/xhtml; charset=utf-8" http-equiv="Content-Type" /> ... </head> My xsl file has, inter alia, this: <xsl:output method="xhtml" html-version="5"/> When I do the transform, I get html5 output, including the meta element, like so: <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Personal Knowledge: Towards a Post-Critical Philosophy</title> ... </head> Oxygen and Jing do not like http-equiv="Content-Type" Uh-uh, no way. They want Default-Style or Refresh, and nothing else will do. I went through every contortion I could think of to recast teh meta element, to no avail. I could generate a second meta element, but I could not get rid of the original meta. I was as though that meta was hard coded into the html5 transformer. So I have two questions. Is it possible to circumvent the copy of the existing head subelements, including meta? Why is the xslt so stubborn about http-equiv="Content-Type", when the validation rejects it for html5? Peter West "...the kingdom of heaven is like a merchant in search of fine pearls, who, finding one pearl of great value, sold all that he had and bought it." Peter West "...the kingdom of heaven is like a merchant in search of fine pearls, who, finding one pearl of great value, sold all that he had and bought it."