2-XML

Question 1

RE*

Answer 1

RE* menas att de kan finnas 0 eller fler gånger

Question 2

RE+

Answer 2

Finns minst en eller fler gånger

Question 3

RE?

Answer 3

Valfritt (0 eller 1 gång)

Question 4

RE1|RE2

Answer 4

Antingen 1 eller 2 kan matchas

Question 5

What is XML primarily used for?

Answer 5

XML is used for describing and exchanging data, providing a standard language to represent structured information.

Question 6

Why is data often more important than programs in certain contexts like banking or aeronautics?

Answer 6

Data often has a much longer lifecycle than programs and must be accessible for decades, such as in aeronautical technical documentation.

Question 7

What is the main motivation behind using XML for data exchange?

Answer 7

To have a standard language that allows data to be exchanged across systems without being tied to a specific processor or technology.

Question 8

What is a DTD in XML?

Answer 8

A Document Type Definition (DTD) is used to define the structure and legal elements and attributes of an XML document.

Question 9

Why is well-formed XML important?

Answer 9

It ensures that XML data conforms to a tree-like structure, making it easier for applications to process the document correctly.

Question 10

Why is XML considered verbose?

Answer 10

XML requires a lot of repetitive markup and often results in large file sizes due to its structure, but it provides clarity and long-term data compatibility.

Question 11

What advantage does using XML Schema provide over DTD?

Answer 11

XML Schema is written in XML, supports complex data types, allows user-defined types, and is more flexible and powerful than DTD.

Question 12

What are the benefits of validating XML documents?

Answer 12

Validation ensures that the document conforms to the agreed-upon schema, simplifying application logic and ensuring data integrity between producers and consumers.

Question 13

What is the role of attributes in XML?

Answer 13

Attributes provide additional information about elements in XML and can be validated using DTD or XML Schema.

Question 14

What is the purpose of ID and IDREF attributes in XML?

Answer 14

They allow the creation of references between elements, enabling the representation of graph-like structures in XML.

Question 15

What is the significance of the XML Parsing Model?

Answer 15

The model allows XML parsers to process XML data as trees, facilitating efficient data manipulation and exchange

Question 16

What are DOM and SAX in the context of XML

Answer 16

DOM (Document Object Model) stores the entire XML document in memory as a tree, while SAX (Simple API for XML) is event-driven and processes XML incrementally without holding the entire document in memor

Question 17

What is a well-formed XML document?

Answer 17

A well-formed XML document follows proper XML syntax rules, such as correct nesting of elements and having one root element.

Question 18

What does XML Schema provide that DTD does not?

Answer 18

XML Schema supports data types like integers, dates, and booleans, and allows inheritance between element types, which is not possible in DTD.