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1.Notepad, TextPad, BBEdit.
2.Adobe Dreamweaver
3.Altova XMLSpy
4.Microsoft Visual Web Developer Express

1.XPath – Extensible path language
    a.Used to extract data from inside an XML file
    b.Uses a path – like syntax, similar to directory or folder paths like “drive:/folder/folder/file”
2.XSLT – Extensible Stylesheet Language Transformations
    a.Styling language that takes an XML file and “transforms” it into something else, like HTML, PDF, ASCII, or even another XML file

3.XQuery – used to perform query fuctions on XML data, smilar to SQL for databases.
4.XPointer and XLink – used for creating hyperlinks to XML documents and arbitrary points within XML documents.
    -xlink:href=http://dog.com/dogbreeds.xml#xpointer(id('Rottweiler'))

1.XML is extensible markup language
2.Tag-based syntax, very much like HTML
3.By the word 'extensible' means - you get to make up your own tags/ use the existing tag set.
4.Foundation for several next-generation web technologies
    a.XHTML, RSS(Blogs), AJAX, Web services
5.XML does not replace HTML. (XML is a foundational technology, where as HTML has predefined tags to use)
6.What does XML do?
    a.XML is used to structure and describe information.
    b.Intended to be used with the Internet.
    - XML can be used as a way to interchange data between disparate systems. (Example: Interaction between bank and loan company)