Should the homepage contain microdata microformats RDFa

Rich snippet term explanation and definition

A rich snippet is a small, additional extract from the content of websites. This rich snippet is used in search engine technology and shows the content excerpts on the search results pages, i.e. the Search Engine Result Pages. This happens, for example, on Google, Bing or Yahoo. With a rich snippet, the user is able to see in advance whether the websites that are displayed in his search results are relevant for further searches. The rich snippet is also intended to help users make targeted use of certain search queries. A rich snippet contains, in contrast to the snippets, which are a short content or text information under the search results, information supplements. The information additions contained in the Rich Snippet relate to the search results and are also kept simple. The rich snippet can contain, for example, star ratings for a website or product prices.

Introducing the Rich Snippets

The Rich Snippet was introduced by Google on May 12, 2009. About three years later, in April 2012, it was announced by Google that the Rich Snippet Format would be supported for products worldwide.

The microdata

Microdata, which are also called individual data, are original data from statistical surveys. In contrast to the macro data, which are also referred to as aggregated data or group data, these original data relate to individuals. For data protection reasons, the microdata are mostly only published in public use files, i.e. in anonymous form. If such microdata are compressed, i.e. aggregated and checked for plausibility, the microdata can be generated and thus become macro data. Using the microdata, it is possible to label content. Certain types of information can be described by the labeled content. This can be the case, for example, when assessments are given or further information is written about certain people or about events.

The microformats in the context of the rich snippets

The microformats are markup formats that are used for semantic annotation. This is done in the context of XHTML or HTML. These annotations can easily be extracted from the websites. In this way you can make the meanings of the page contents understandable to other programs such as search engines. A suitable microformat was developed for each special knowledge or topic. This means that there are associated micro-formats for appointments, for social relationships or for contact information. The microformats are simple entities. These microformats can also be used on websites. They can be used to describe certain types of information. Each of the entities has its own special properties. For example, people have properties such as their name, address or email address.

The introduction of RDFa

RDFa for the RDF in Attributes is a W3C recommendation. RDFa enables RDF statements to be embedded in both HTML and XHTML and a number of other XML dialects. Together with the Microdata and the Microformats, the RDFA is one of the most common methods for upgrading HTML or XHTML sites with additional information that is computer-readable. RDFa also belongs to the semantic web technologies.

The RDFa as a module in XHTML

As early as 2005, Mark Birbeck published a possible concept in the XHTML and RDF publications, which can be viewed as the basis for RDFa. However, the term RDFa did not appear in this publication. It was not until 2007 that the ideas were included in the design by W3C. This is the XHTML RDFa draft.

The development of RDFa 1.0

In 2008, RDFa was officially recommended by W3C. Especially with regard to the XML namespaces, the RDFa 1.0 relies heavily on the extension mechanisms in XML. However, this meant that the RDFa 1.0 could not be combined with classic HTML and could only be used in XHTML.

The introduction of RDFa 1.1 and RDFa Lite

RDFa 1.1, i.e. the current version of RDF, was included in the W3C recommendations in 2012. Compared to RDFa 1.0, the main difference here is that the XML-specific peculiarities have been dispensed with. As a result, the RDFa can now be used in XML dialects such as SVG or Atom, as well as in HTML, i.e. also in HTML 5. The RDFa Lite was also created at the same time as the RDFa 1.1. The RDFa Lite is not an independent variant. RDFa Lite is rather a subset of RDFa. In the RDFa Lite, the complexity is reduced, which makes the use of RDF easier to understand and easier to use, especially for beginners. The types of information in RDFa are synonymous with either elements or entities. Each of the entities has a certain number of properties. In the case of people, this is the name, for example.

The different types of rich snippets

A distinction is made between different types of rich snippets. For example, event information is a rich snippet type. This can be event information about concerts that take place on a specific day. This event information can be displayed through a rich snippet. Organizational data is further details and data on a specific company or a restaurant. These companies are featured in the body of the website. The organizational data can help with queries to the search engines to assign the location data. A breadcrump or a navigation path is an information that is composed of several links. This navigation path enables users to better understand the hierarchy of a website. As a result, you can navigate better through this rich snippet on the corresponding website. The experience reports are a rich snippet that users can use to submit reviews. This can take the form of stars, for example. Through this rich snippet, other users can see the reviews of a product or service. However, a rich snippet can also display a person's contact information. This happens especially with social networks. If the contact details of the registered users are listed in the text bodies of the website, they can be displayed in the search results. With a rich snippet for recipes, users are provided with additional information on a specific cooking recipe. Such additional information, which is displayed in the rich snippet, can be, for example, the calorie information or the preparation time. Here, too, it is possible to provide ratings via the rich snippet. A rich snippet can also be used for apps. This can be the case, for example, when certain information is marked. In this way, the search engine can identify what information is involved. As a result, the details about this will appear better in the search results. But assessments or ratings can also be displayed as a rich snippet. The ratings or reviews that have been given will be displayed on that site. In most cases, ratings are given on a scale between 1 and 5, in ascending order. For music, users search for songs or albums. Here, the search engines display the relevant information or links in the search results. In the case of products, a rich snippet is used to provide users with additional information about certain products.

The semantics of the rich snippets

By using a rich snippet, additional meanings of web pages can be shown. These meanings are often equated with semantics. The trend to use such codes has existed on the internet for a long time under the term Semantics Web.

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