JS Morisset

Is Google Search reporting invalid Schema markup from your theme templates?
Do you need to remove old Microdata and RDFa markup from your theme templates?
Do you need to remove duplicate social or SEO meta tags from your webpage?

By default, the WPSSO Strip Schema Microdata (WPSSO SSM) add-on can remove old Schema Microdata and RDFa markup from the webpage. The settings page also allows for the optional removal of duplicate / conflicting Schema markup and meta tags from the webpage head or body sections.
WPSSO SSM filters the webpage dynamically, allowing you to activate or deactivate the add-on to enable or disable the removal of old Schema Microdata, RDFa, and duplicate meta tags. The WPSSO SSM webpage filter is very fast – generally running in under 0.003 seconds.

<h3>WPSSO Core Required</h3>
WPSSO Strip Schema Microdata is an add-on for the <a href="https://wordpress.org/plugins/wpsso/" rel="ugc">WPSSO Core plugin</a>, which creates extensive and complete structured data to present your content at its best for social sites and search results – no matter how URLs are shared, reshared, messaged, posted, embedded, or crawled.

WPSSO Strip Schema Microdata

Remove Schema Microdata and RDFa from the webpage for better Google Rich Results using Schema JSON-LD markup.

zeko3991

Wikidata References will add a new field to tags and categories for adding a Wikidata Item ID to which tags and categories terms will be associated to.
Also it will provide the site admin the option to add a link to those associated Wikidata items to the head metadata section, or to the tag/category archive title.
User will also have the option to frame tag and categories archive pages links into a Schema.org 
microformat.
This plugin was developed under the requisites of a Wikimedia phabricator request at 
<a href="https://phabricator.wikimedia.org/T138371" rel="nofollow ugc">https://phabricator.wikimedia.org/T138371</a>

Wikidata References for WordPress

Really liked this plugin. Useful. Doesn't add unnecessary taxonomies. Would be interested in seeing what other features it could add. Authors with Wikipedia pages or Wikidata entries could be linked as well from their profiles. 

One of the few plugins that seems to get the core idea really well.

Very excellent

Wikidata References is a plugin developed to help WordPress users to add associations among the tags and categories they use in this WordPress website …

WPSSO Strip Schema Microdata vs Wikidata References for WordPress