Final Report of Lab-2 by Kavitha Ashwin

For Full Version @ "weblab2-k.doc" with diagrams.

DTD (Document Type Definition):-

Building Block of XML document. 2 ways for declaration:-

Internal Declaration:

Example:-

Tove Jani Reminder Don't forget me this weekend

External Declaration:

Example:-

Tove Jani Reminder Don't forget me this weekend!

We require DTD to verify the validation of data.

The 5 building blocks are:-

1> Elements: are main building blocks. Eg: abcd�.zzzz, pqr

2> Attributes: provides extra information about elements. Eg:

3> Entities: special meaning character, for example:- Entity References Character < < > > & & " " ' '

4> PCDATA: parsed character data (data found between start tag and end tag) Eg: abcd�.zzzz, where �abcd�.zzzz� is PCDATA PCDATA is text that WILL be parsed by a parser

5> CDATA: character data (data found between start tag and end tag) CDATA is text that will NOT be parsed by a parser

Using child elements is more handy than using attributes in XML. Metadata (data about data) should be stored as attributes, and that data itself should be stored as elements. Reference Example: http://w3schools.com/dtd/dtd_examples.asp

XML Schema:-

Describes structure of XML document, is an alternative to DTD. XML Schemas are the Successors of DTDs. Also known as XSD (XML Schema Definition). XML Schema became a W3C? Standard.

XML Schemas are more powerful than DTD:-

1> Supports Data Types 2> Uses XML Syntax 3> Secures Data Communication 4> Are Extensible

(a) XSD Simple Elements: A simple element is an XML element that contains only text. It cannot contain any other elements or attributes. (b) XSD Complex Elements: A complex element contains other elements and/or attributes.

With XML Schemas, you can also add your own restrictions to your XML elements and attributes. These restrictions are called facets.

Constraint	Description
enumeration	Defines a list of acceptable values
fractionDigits	Specifies the maximum number of decimal places allowed. Must be equal to or greater than zero
length	Specifies the exact number of characters or list items allowed. Must be equal to or greater than zero
maxExclusive	Specifies the upper bounds for numeric values (the value must be less than this value)
maxInclusive	Specifies the upper bounds for numeric values (the value must be less than or equal to this value)
maxLength	Specifies the maximum number of characters or list items allowed. Must be equal to or greater than zero
minExclusive	Specifies the lower bounds for numeric values (the value must be greater than this value)
minInclusive	Specifies the lower bounds for numeric values (the value must be greater than or equal to this value)
minLength	Specifies the minimum number of characters or list items allowed. Must be equal to or greater than zero
pattern	Defines the exact sequence of characters that are acceptable
totalDigits	Specifies the exact number of digits allowed. Must be greater than zero
whiteSpace	Specifies how white space (line feeds, tabs, spaces, and carriage returns) is handled

Indicators: Order, Occurrence, Group.

Reference Examples: http://w3schools.com/schema/schema_example.asp

Mind-Mapping:-

Downloaded mindmap from the site: http://freemind.sourceforge.net/wiki/index.php/Download

Also Created a mindmap @ weblab2-k.doc

mindmap.JPG:

Also learnt that mozilla is better than internet explorer for twiki, as while edit option in twiki when used internet explorer I couldn't perform formatting, bullets etc. But if I use mozilla I could formate, use bullets etc.

BrainStroming:-

1> Mindmap was fun, expressing your ideas in a tree structure helps in understanding the idea in a glance.

2> But I feel more comfortable using MS-powerpoint than mindmap as you can add more creativity in powerpoint, I kind of feel restricted in mindmap. As this version of mindmap had very less features.

3> I tried to download other softwares of mindmap but those were fancy but came with trail versions.

-- KavithaAshwin - 01 Nov 2008

weblab2-k.doc: weblab2-k.doc

Final Report of Lab-2 by Kavitha Ashwin

For Full Version @ "weblab2-k.doc" with diagrams.

Attachments Attachments