Tech Review Software: Wednesday, February 15, 2012

xml namespace example

http://www.w3schools.com/xml/xml_namespaces.asp

• Name conflicts
• <table>
• <tr>
• <td>Apples</td>
• </tr>
• </table>
• <table>
• <name>Stan</name>
• </table>
• Solving name conflict using a prefex
• <h:table>
• <h:tr>
• <h:td>Apples</h:td>
• <f:table>
• <f:name>Stan</f:name>
• XML Namespaces - the xmlns attribute
• namespace for prefix must be defined
• defined by xmlns attributes in the start tag of an element.
• xmlns:prefix="URI"
• when a namespace is defined for an element, all child elements with the same prefix are associated with the same namespace.
• The namespace URI is not used by the parser to look up information.
• URI - Uniform Resource Identifier
• identifies an Internet Resource
• URL - uniform resource locator
• identifies an Internet domain address
• URN - uniform resource name
• default namespace for an element
• saves using prefixes in all child elements

http://www.w3schools.com/schema/schema_example.asp

• root element
• xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
• tells the XML parser that the document should be validated against a schema.
• xsi:noNamespaceSchemLocation="shiporder.xsd"
• specifies where the schema resides.
• local to xml in this instance
• XML Schema Definition (XSD)
• <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
• ...
• </sx:schema>
• Standard namespace above is (xs)
• URI associated with namespace is the Schema language definition
• standard value of "http://www.w3.org/2001/XMLSchema"
• Define all element and attributes first and than refer to them
• ref="name"
• Can use named types

http://www.w3schools.com/schema/schema_intro.asp

http://msdn.microsoft.com/en-us/library/aa468547.aspx

• XML - eXtensible Markup Language
• XML parser
• XML Document Object Model (DOM)

http://msdn.microsoft.com/en-us/library/windows/desktop/ms752838(v=vs.85).aspx

• XSD schemas or Document Type Definitions (DTDs) to verify validity
• XmlLite vs System.XML
• XmlLite does not schema validation
• use MSXML.exe

http://msdn.microsoft.com/en-us/library/windows/desktop/ms752816(v=vs.85).aspx

• XmlLite Security
• Denial of Service (DoS)