1. What is the name of the variable that points to the root object in a tree created by a PHP DOM parser? documentElement

  2. What function would you call on a DOM node object to retrieve all children elements with the tag "price"? getElementsByTagName

  3. What two functions can you call on an xpath object in order to have it evaluate an expression and return all nodes that meet the criteria for that expression? evaluate and query

  4. What is the function that creates a new element node (not the one that inserts it into the tree but the one that simply creates a new node)? createElement

  5. What command do I call to save a modified XML document? saveXML