Schema

Question 1

What is a schema and what is the base language?

Answer 1

A schema can be used to define XML document tree structure (like DTD).

It’s a XML based language - XML used to describe XML!

There is an XML Schema Document which describes the XML schema language.

Question 2

How do you start a xml schema document?

Answer 2

See attached

Question 3

How do you define an element in xsd (schema language)?

Answer 3

Define element called element with attributes name and type.

It uses an empty element

See attached.

Question 4

What is occurence constraint similar to in DTD?

Show an example of a occurence constraint.

Answer 4

An occurence constraint is similar to multiple elements in DTD.

Although you can set the max and min occurrences:

minOccurs = "numeric"
maxOccurs = "numeric" | "unbounded"

Question 5

How do you show structure and multiple choices in xsd?

Answer 5

Using xsd:sequence and xsd:choice

See attached for example.

Question 6

Types like xsd:string, xsd:integer etc are Simple Types.

Describe and give an example of a Complex Type.

Answer 6

Complex types allows you to define new types.

Any element with child elements as content can be defined using a complex type.

See attached example.

Question 7

How do you define attributes in xsd?

Answer 7

xsd:attribute name =”foo” type=”xsd:string” use=”required” fixed=”4” default=”3”

• *use:** - required | optional | prohibited
• *fixed:** - takes any constant
• *default:** - takes any constant