The content of the previous paragraph is who the work is presented to, usually elegant, corrected, revised, appreciated and so on.
The next paragraph is generally more content, which can be decided according to the size of the basic blank.
Usually add a word after the author's name, such as a book. Year, year and book
The complete content is the source of Tang poetry+author+year when the author wrote+author's name+writing place.
As you said, it can generally be signed as: a poem of Tang Dynasty+a certain year and month+author's name+writing place. The writing place can decide whether to write or not according to the size of the blank space.