Schema.org is a collaborative, community activity with a mission to create, maintain, and promote schemas for structured data on the Internet, on web pages, in email messages, and beyond.
Schema.org – http://schema.org
Microdata is a specification to embed machine-readable data in HTML documents. Microdata consists of name-value pairs (known as items) defined according to a vocabulary. A collection of commonly used markup vocabularies are provided by schema.org
Source – https://developers.google.com/schemas/formats/microdata
JSON-LD is an easy-to-use JSON-based linked data format that defines the concept of context to specify the vocabulary for types and properties.
Source – https://developers.google.com/schemas/formats/json-ld
The Structured Data Testing Tool (SDTT) provides a variety of ways to develop, test, and modify your structured markup. You can load markup into the tool either directly or by supplying a URL.
The validator lets you check all the most common microformats: microdata, schema.org, microformats, OpenGraph and RDF.
<section itemscope itemtype="http://schema.org/Person"> Hello, my name is <span itemprop="name">John Doe</span>, I am a <span itemprop="jobTitle">Graduate research assistant</span> at the <span itemprop="affiliation">University of Dreams</span> My friends call me <span itemprop="additionalName">Johnny</span> You can visit my homepage at <a href="http://www.example.com" itemprop="url">www.example.com</a> </section>
<script type="application/ld+json"> { "@context": "http://schema.org", "@type": "Person", "name": "John Doe", "jobTitle": "Graduate research assistant", "affiliation": "University of Dreams", "additionalName": "Johnny", "url": "http://www.example.com" } </script>