Querying XML

Querying the Web: From HTML to XML

Outline

Finding Web Information

Why it is difficult?

Let’s try

WebSQL

Araneus

Using HTML tags (WebMethods)

How to do it better?

Querying SGML

The RIO language

A RIO example

XML as simplified SGML

XML links

XML link (example)

Querying XML links

What about Metadata?

Dublin core in HTML

XML data schema

An example with XML-data (schema)

An example with XML-data (instance)

Conclusions