are gramatics and puncuation different within the context of poetry?

Answer 1

It depends on the poet and the format of the text. There will always be major differences in the usage of full-stops (.), commas, and other punctuation. For example, read e.e. cummings and the Ralph Waldo Emerson and see if you can spot the difference in use of punctuation.

Answer 2

Poetic license, refers to the ability of a poet to ignore some of the minor requirements of grammar for poetic effect. For example, Mark Antony's "Friends, Romans, Countrymen, lend me your ears" from Shakespeare's Julius Caesar would technically require the word "and" before "countrymen", but the conjunction "and" is omitted to preserve the rhythm of iambic pentameter. Conversely, on the next line, the end of "I come to bury Caesar, not to praise him" has an extra syllable because omitting the word "him" would make the sentence unclear, but adding a syllable at the end would not disrupt the meter. Both of these are examples of poetic license.