Understanding XML

Extensible Markup Language (XML) as its name states is a markup language that is extensible (can be extended). XML is a simplified subset of the greater Structured Generalized Markup Language (SGML), and is designed to be self-describing.

XML markup uses tags enclosed within angle brackets "<" and ">" to define the tag. XML tags come in matching pairs, one used to open the tag content, and the other to close the tag content. These open and close tags are used to sandwich or wrap around the content of the tag, which is placed between the open and close tags.

 to provide additional information about the data contained between the paired start and closing XML tags. or Metadata, data about data ...

The Semantic Web

Facilities to put machine-understandable data on the Web are becoming a high priority for many communities. The Web can reach its full potential only if it becomes a place where data can be shared and processed by automated tools as well as by people. For the Web to scale, tomorrow's programs must be able to share and process data even when these programs have been designed totally independently.

The Semantic Web is a vision: the idea of having data on the web defined and linked in a way that it can be used by machines not just for display purposes, but for automation, integration and reuse of data across various applications. Visit http://www.w3.org/2001/sw/.

"The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work in cooperation." – Tim Berners-Lee, James Hendler, Ora Lassila, The Semantic Web, Scientific American, May 2001.

 

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