Comparison with Relational Data Unlike relational tuples,XML data is self- documenting due to presence of tags Non-rigid format:tags can be added Allows nested structures Wide acceptance,not only in database systems,but also in browsers,tools,and applications 77 Comparison with Relational Data „ Unlike relational tuples, XML data is self￾documenting due to presence of tags „ Non-rigid format: tags can be added „ Allows nested structures „ Wide acceptance, not only in database systems, but also in browsers, tools, and applications