Tatoeba is a collection of (1) sentences that are meant to look and sound natural but are not necessarily limited to a particular situation and (2) links between two sentences that can match in at least one situation, but are not guaranteed to match in every respect. Once a translation is added to a sentence, the translation and the original sentence are equally important. The translation is meant to be able to stand on its own; it is not as though its only purpose is to tell you what the original sentence means. Therefore, it also has to be natural.

The English sentence "Did you work yesterday?" could be either formal or informal. There's not enough context to decide. Capitalizing "you" would violate the "look natural" requirement, especially because a capitalized pronoun is generally reserved for a deity in a monotheistic religion (as is mentioned on the linked page in Thanuir's comment). Similarly, adding "(formal)" to the text of the sentence would also make it look unnatural, and is against the site's guidelines.

The Italian sentence "Lei ha lavorato ieri?" matches at least one situation in which "Did you work yesterday?" could be used, namely to address someone formally. So they are valid translations of each other in the Tatoeba world. If someone wants to copy the pair to a place outside Tatoeba and manipulate one or both of the sentences in some way (add tags, colors, or explanatory notes) so that learners could know that they're supposed to provide the formal "Lei" where English has the formal or informal "you", they are free to do it there. But doing it inside Tatoeba would violate the way the site works.

Erityisesti, se ei liity mitenkään Meta-yhtiöön, vaan on yleinen termi joka tarkoittaa esimerkiksi viestiin tai dokumenttiin liitettävää tietoa, joka kertoo mistä asiassa on kyse.

Esimerkiksi sähköpostin lähettäjätiedot ja lähetysaika on metadataa, kun taas sähköpostiviestin sisältö on varsinaista dataa, ei metadataa.

Vertaa metafysiikka filosofian osa-alueena.