I'm trying to make an EPUB2 document and the validator is giving me errors on the copyright date line in the metadata area of content.opf: "Error while parsing file 'attribute "property" not allowed here; expected attribute "content", "id", "name", "scheme" or "xml:lang"'." For this error, I got the syntax from a web page, but I can't find any other web page for copyright date. Here's line 16 with the error. 
	Code:
	<meta property="dcterms:dateCopyrighted">1922-12-01</meta>
 One web page says the format should be: 
	Code:
	<meta name="xxx" content="xxx" />
 But where do I get a list of NAMEs and what the content is with examples? That's the part I cannot seem to find. 
Thanks.