Some of the issues in discussion between MARC and XML deal with the desire to expand the content of the bibliographic record. An often-cited example is the library that wishes to enrich the current electronic record with a table of contents. Although a table of contents inclusion is actually possible with the MARC record, it is certainly not an ideal platform for such content. The MARC record is described as being a "flat" record, meaning it does not have a hierarchal nature. As such, it is a poor candidate for hierarchal structures such as a table of contents. A discussion of strengths and weaknesses and perceived risk of XML adoption is given.