XML in the 'NET Framework: Past, Present

1
XML in the .NET Framework Past, Present Future

• Dare Obasanjo
• Program Manager
• Microsoft Corporation
• dareo_at_microsoft.com

2
XML in VS

• VS 2001 and VS 2003
• System.XML in .Net Frameworks
• Rudimentary XML Editing Tools
• VS 2005
• New Features in System.XML
• XML Editor and the XSLT Debugger

3
XML in Visual Studio 2005

• System.Xml v1.0 Design Goals
• Standards compliance
• Extensibility
• Integration with ADO.NET
• Additional System.Xml v2.0 Design Goals
• Usability
• Performance
• Enhanced Security
• XML Tools in Visual Studio

4
System.Xml V1.0
5
XML I/O Scenarios Streaming XML

• Reading XML from file, http, or other source
• Fast, Forward-only pull model parser
• Factory methods for creating instances (v2.0)
• Pipelining and layering functionality such as
  schema validation (v2.0)
• Preventing Denial of Service attacks (DoS) and
  unauthorized resource access (v2.0)
• Writing XML
• Fast, forward-only push model XML writer
• Wellformedness checking when writing (v2.0)
• Both Support Typed Untyped XML CLR types from
  XML
• Use the XmlTextReader and XmlTextWriter in
  combination
• Simple transformations

6
Filtering and Traversing When Reading

• Limiting Access to Part of a Document
• XmlReader ReadSubTree()
• Returns a new XmlReader, which reads the current
  node and all of its descendant.
• XPath Axis Methods
• bool ReadToFollowing (string name)
• bool ReadToDescendant (string name)
• bool ReadToNextSibling (string name)
• Provides an easy way to find a named element by
  moving the XmlReader to the next following,
  descendent or sibling element that matches the
  specified name.

7
XML I/O Scenarios In-Memory XML

• XmlDocument
• Tree model API
• Supports DOM Level 1 and DOM Level 2
• Exposes subset of PSVI (v2.0)
• Validation of subtrees after edits (v2.0)
• XPathNavigator
• Cursor model API
• API integrates with XmlReader XmlWriter (v2.0)
• Exposes subset of PSVI (v2.0)
• Validation of subtrees after edits (v2.0)

8
Parsing XML
demo
9
XmlSchemaSet and Inference

• New XmlSchemaSet class
• stores schemas and correctly handles multiple
  references to inherited schemas
• replaces XmlSchemaCollection
• System.Xml.Schema.Inference class
• Can infer schema from an XML document
• InferenceOption enumeration defines how data
  types and schema occurrences found in the
  document are interpreted
• values are Relaxed or Restricted

10
Improved Performance in V2.0

• XSLT 400 faster (4x) generates MSIL code
• XmlReader 100 faster (2x)
• XmlWriter 100 faster (2x)
• XML schema validation 20 faster

11
XSLT

• .NET V1.0 has interpretered XSLT
• The XslTransform class
• .NET V2.0 introduces compiled XSLT
• The XsltTransform class
• XSLT Stylesheets are compiled to CLR MSIL
• (MS intermediate language)
• Generates debugging information
• XSLT Scenario
• Compile once execute many times

12
System.Xml V1.0
13
System.Xml V2.0
XmlSchemaSet
14
XML Tools In Visual Studio 2005XML Editing and
XSLT Debugging
demo
15
XML Editor in VS 2005

• Deep Integration with Visual Studio
• Same code editor keys as for other editors in VS
• Errors in the error list
• Support for Property window
• XML 1.0 Compliance checking
• Namespace and Validation support
• Context and Namespace Sensitive Intellisense
• Design time validation checking and error
  reporting
• Element completion
• Infer a Schema from an Instance XML file

16
XSLT Debugger in VS 2005

• Deep Integration with VS
• Locals/Watch Window Support
• Call Stack Support
• Support XSLT 1.0
• Start debugging from an XSLT File
• Step in From C
• View output when stepping

17
Summary

• In V1.0 the XML support in .NET provides the
  ability to easily work with XML
• In V2.0 there are many significant improvements
  to address usability, performance and XML tools
  within Visual Studio 2005

18
Community Resources

• Me
• email neetur_at_microsoft.com
• VS2005 Beta Downloads and Feedback
• Beta 1 http//lab.msdn.microsoft.com/vs2005/
• Can also post and track bug report
• MSDN XML Developer Center
• http//msdn.microsoft.com/xml/
• What's New in System.Xml for VS2005
• Introduction XML Tools In VS2005
• Newsgroups
• microsoft.public.dotnet.xml for V1
• microsoft.beta.whidbey.xml for V2

19
(No Transcript)