keywords viewport user-scalable=yes, width=device-width, initial-scale=1 schema.DC http://purl.org/dc/elements/1.1/ schema.DCTERMS http://purl.org/dc/terms/ transformation mex.xsl application/xsl+xml DC.rights license http://creativecommons.org/licenses/by/3.0/de/ , , alternate application/xhtml+xml .xhtml. text/html .html. text/html .html. application/xhtml+xml .xhtml.