AWT- Document tree implications

What are the implications of the concept of the document tree?

# Initially, the Document tree is the tree of elements encoded in the source document. Each element in this tree has exactly one parent, with the exception of the root element, which has none. http://www.d.umn.edu/itss/support/Training/Online/webdesign/glossary/d.html

The terminology that XML apply to explain the various relationships with in a document can be confusing at first, co-relation among the children element of same level but from different parent can be missed, difficult to find a particular element due to many child elements. As the branch of the tree is connected to each other so if at some point, something goes wrong or developer like to modify a particular tag for the parents, than they have to modify for all of this Children which is hassle and time consuming.