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Microdata extends HTML5 in a way that link and meta elements can be used in the body, if they contain an itemprop attribute.

If the itemprop attribute is present on link or meta, they are flow content and phrasing content. The link and meta elements may be used where phrasing content is expected if the itemprop attribute is present.

This extension is currently also included in the HTML 5.1 Nightly (Editor’s Draft) (see link element and meta element). But as the Microdata specification became a W3C Note recently, we’ll have to see what happens with this reference.

RDFa 1.1 extends HTML5 in a way that link and meta elements can be used in the body, if they contain a propertỳ attribute.

If the @property RDFa attribute is present on the link or meta elements, they MUST be viewed as conforming if used in the body of the document. More specifically, when link or meta elements contain the RDFa @property attribute and are used in the body of an HTML5 document, they MUST be considered flow content.

So you are not allowed to use any link element (e.g., <link href="" rel="" />) in the body, but only those with an itemprop attribute (for Microdata) resp. a property attribute (for RDFa).