w3c validation - Microdata in XHTML 1.1: there is no attribute "itemprop" -

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i added microdata product pages of site. leads errors. 1 of these errors following:

there no attribute "itemprop"

the error related source code line:

<div itemprop="offers" itemscope="" itemtype="http://schema.org/offer">

my doctype follows:

<!doctype html public "-//w3c//dtd xhtml 1.1//en"  "http://www.w3.org/tr/xhtml11/dtd/xhtml11.dtd">

how possible make page w3c compliant when keeping same doctype?

microdata can used in (x)html5.

if want use schema.org vocabulary in xhtml 1.1, use rdfa, require changing doctype to

<!doctype html public "-//w3c//dtd xhtml+rdfa 1.1//en"   "http://www.w3.org/markup/dtd/xhtml-rdfa-2.dtd">

(see answer differences between microdata , rdfa.)


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