XLM (Introduction - Tidwell)
-Extensible mark-up language
-Use to create your own tags
-Created to overcome the limitations of HTML
-Designed the web in mind
-XML is needed to tell computer what todo and what information should do for the user
-3 common terms/part of XML: tags, elements and attributes
-XML simplifies data interchange
-Enables smart coding and smart searching
-3 kinds of XML decent:
invalid document: breaks the rules of XML/DTD and Schema
valid documents: follows all rules of XML, DTD and Schema
well-formed documents: follows XML document, but not DTD or schema rules
-Elements cannot overlap
-End tags are required
-are case sensitive
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