Thank you, Kevin, for your quick and clear reply
My knowlege of HTML is average, and I used to always declare language in DTD as PT.
I edited Metadata as soon as I started discovering
Sigil features, and of course saw the language definition immediately echoed in content.opf
Please excuse my question!
I am using
Sigil to edit some portuguese epubs (free e-books of Portuguese litterauture) which have some spelling mistakes, so I can read them later in my tablet - and share them, too.
I didn't like the way Calibre filled my files with <span> tags each time it found some accented character (like "agradável", "manhã" - quite common portuguese words).
Altough this is for personal use, I like things properly done, and
Sigil allows me that.
Thank you again