Metadata Standards
As introduced in the Item section, each object is equipped with a description provided by a trustworthy institution. This description is usually expressed in the form of standardized metadata. For this reason, we decided to introduce here an analysis of our items that includes information about typology, provider, country of the provenance and metadata standards used by the provider. When aggregators or institutions did not specify the employed standard, we used a standard of our choice that we thought would better suit the description of the item.