The implementation using RDFa is based on a slightly different approach. Instead of combining the structured data into one – also human-readable – block as in JSON-LD, the data is distributed over the entire content of a page. RDFa are 'HTML5 extensions': existing HTML elements are extended and provided with additional information, in this case for marking structured data.
Also read: Score higher in Google with structured data [5 steps]
Microdata
HTML extensions are also used at Microdata. However, Microdata is considered outdated and is no longer actively developed. Nevertheless, I still regularly come across websites, also from customers, that still work with Microdata. That is why it is relevant to briefly mention this option here.
Which format is best to use?
If you haven’t implemented structured data yet, I recommend using JSON-LD. Thanks to support from Google, Bing (since July 2018) and Baidu, this format is now ready for three of the big four search engines. Only the Russian search engine Yandex currently only supports Microdata and RDFa. If structured data using Microdata or RDFa has already been implemented, this can of course be retained. However, it should be checked regularly how long the search engines will continue to support qatar telegram data these two formats in the future.
Some of the markups have additional requirements that you should consider during implementation. These specific guidelines are all listed in the Feature Guide on the Google Developers Portal .
With so many different guidelines, it’s easy to make certain mistakes in markup. Even Google’s Structured Data Testing Tool isn’t always helpful. Some common mistakes are easy to miss, so here’s a quick summary.
Ratings or reviews (review snippet)
While using (third-party) widgets to implement ratings or reviews is generally not a problem, there are a few things to keep in mind. It is especially important that the review layout always refers to the main content of a page. A common mistake is that a general review of a webshop is displayed page-wide via a widget, and can therefore also be seen on individual product pages.
Since this review is about the webshop itself, and not about the individual products, Google may consider this as spam. In addition, reviews that do not originate from the website.
