XML

REVISED: Sunday, March 3, 2013

You will learn the fundamentals of XML.

I.  WELL FORMED XML

The Extensible Markup Language (XML), is well formed when it has:

A.  Single root elements.

B.  Properly nested matched tags.

C.  Unique attributes within elements.

You have more flexibility and ease of change with well formed XML.

II.  VALID XML

Adheres to basic structural requirements and content-specific specifications.

Two languages, Document Type Descriptors (DTDs) and XML Schema Descriptions (XSDs) are used to type the XML data and make it valid XML.

It is possible for the specifications to become larger than the document itself.

III.  DTDs and XSDs

A.  BENEFITS OF USING

Describes the structure of the data.

Provide the benefits of strongly typed data.

Grammar type language for specifying elements, attributes, nesting, ordering, and # occurrences.

Programs that use them, and CSS/XSL, can assume structure.

Specification language for data exchanges.

Documentation for data exchange.

B.  BENEFITS OF NOT USING

Provide the benefits of no typing of data.

Flexibility

Ease of change

DTDs can be messy if the documents are irregular.

Specifications can become larger then the document itself.

IV.  IDs & IDREFs

IDs and IDREFs help you establish pointers within a document.

You have learned the basic fundamentals of XML.

Elcric Otto Circle

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