Note 6 for XML

Note 6 for XML

Watch & Read:

What is a namespace: A namespace is a set of definitions or rules for naming elements that is located on the Internet.

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
is the default namespace for schemas.

If I wanted to create a namespace called Jon for my XML documents. I would have to identify a location (URL or URI) on the Web that has the naming convention I created documented.

<Jon:root-element xmlnsp:Jon="http://www.pvc.maricopa.edu/~storslee/cis234/schema">

Schemas is a more powerful version of DTD!

Schemas are extensible to future additions

Schemas are richer and more useful than DTDs

Schemas are written in XML

Schemas support data types

Schemas support namespaces

The book breaks down Schema into DataType & Structures.

A DataType specifies the type of information to be found and add constraints as to what is acceptable.

Schema Structures areSimple or Complex

Syntax for Schemas: Sample XSD

<?xml version="1.0" ?> To identify it as an XML document

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

Schema definitions

</xs:schema>

(Save the file with the extension of xsd, example: jon.xsd)

Common XML Schema Data Types

xs:string	xs:integer	xs:date
xs:decimal	xs:boolean	xs:time

The Syntax for attching a Schema (for a XML document without a defined namespace) to an XML document is:

<?xml version="1.0"?>

<RootElement xsi:noNamespaceSchemaLocation="cis234.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

XML Elements & Attributes

</RootElement>

Review the following:

W3schools Schema

Schema for class

Online Validation using Schema's can be found at http://www.w3.org/2001/03/webdata/xsv

Terms you need to Lookup:

Schema, DataTypes, Simple Elements, Complex Elements,

DataTypes: integer, string, decimal, date, time

Homework:

You should be reading Chap 9 & 10

Create a Schema for each of your XML documents

Final Step:

Review in your mind everything we covered in class and remember to cover it again before you go to bed so your mind to process this information while you sleep.