This paper presents metadata elements with the use of FAQ (Frequently Asked Questions). Metadata elements will build a new library called the “hybrid library”, with the aim to connect with the “old library” and “digital library”. Metadata elements in this paper are looking at the different points of view accordly to the different categories of users. This paper doesn’t contain lists of standard and format, neither Dublic Core format (with its 15 elements) or the well-structured MARC: both well-known all over the world. Inside, this paper wants to give a clear explanation of Metadata word and elements: it describes with particular attention the structure of any elements related to domains each others. How? What? Where? How many? Who? When? Why? and so on…