XML

Question 1

What is the Document Object Model (DOM)

Answer 1

a framework for manipulating XML documents

Question 2

What are the language-specific versions of DOM methods and objects called?

Answer 2

bindings

Question 3

What is parsing (DOM)?

Answer 3

reading from a file to a DOM tree

Question 4

What is serialisation (DOM)?

Answer 4

writing DOM tree to a file by converting the DOM tree into an XML character stream

Question 5

What is processing (DOM)?

Answer 5

manipulating the DOM tree

Question 6

In Java, how would you get the root/document element of a document?

Answer 6

doc.getDocumentElement()

Question 7

Code to create a parser in Java

Answer 7

DocumentBuilderFactory factory
= DocumentBuilderFactory . newInstance (); DocumentBuilder parser
= factory . newDocumentBuilder ();

Question 8

what are the three types of node?

Answer 8

1. Element
2. Attribute
3. Text

Question 9

What is the very top of the DOM hierarchy called?

Answer 9

Document node

Question 10

What two children does the document node always have?

Answer 10

1. Document element
2. Document type

Question 11

What is canonicalization?

Answer 11

a process used to ensure that data is represented in a standardized and consistent form, resulting in a single DOM tree

Question 12

Advantages of DOM (5)

Answer 12

1. Conceptually clear
2. Random access to entire doc
3. Change documents
4. Create documents
5. Output results

Question 13

Disadvantages of DOM (5)

Answer 13

1. We hold entire syntax tree in memory
2. Costly if document is very large
3. Or if the document is never complete
4. We also have to wait for complete tree before we output results
5. Can’t start output based on partial
   tree.

Question 14

How does event-based parsing (SAX) differ from tree-based parsing (DOM)?

Answer 14

is it not required that the entire document is loaded into memory as a tree structure