I need help with this xml assignment.

. The following XML document describes some entries of a library Verlag Databases id="TODS-1-2003 Kauthor>U. Known 1. Check if the XML document is well-formed. If it is not, change it so that it becomes wellformed, making as little changes as possible. 2. Write a DTD for this XML document such that the corrected and the following "requirements" hold: version of the example is a valid XML document a. book, journal and misc can occur in any sequence within the library tag b. title is mandatory c. there can be only one title, editor, publisher, volume, and year for a library entry d. there may be more than one author for an entry 3. Validate the XML document using validate js.htm (or any other XML validator)