XML Schema Tutorial
XML Schema
- XML Schema Definition (XSD)
- what is an XML Schema?
- defines elements that can appear
- defines attributes that can appear
- defines which elements are child elements
- defines order of child elements
- defines number of child elements
- defines if empty or can include text
- defines data types for elements and attributes
- defines default and fixed values for elements and attributes
- Can reference schema in XML doc
- XML Schema built-in data types
- xs:string
- xs:decimal
- xs:integer
- xs:boolean
- xs:date
- xs:time
- if an elements has attributes it is considered complex
- Can add restrictions or 'facets' to a element or attribute
D:\\test>xsd webSearch.xml
Microsoft (R) Xml Schemas/DataTypes support utility
[Microsoft (R) .NET Framework, Version 2.0.50727.42]
Copyright (C) Microsoft Corporation. All rights reserved.
Writing file 'D:\\test\\webSearch.xsd'.
D:\\test>
D:\\test>xsd webSearch.xsd /CLASSES /language:vb
Microsoft (R) Xml Schemas/DataTypes support utility
[Microsoft (R) .NET Framework, Version 2.0.50727.42]
Copyright (C) Microsoft Corporation. All rights reserved.
Writing file 'D:\\test\\webSearch.vb'.
D:\\test>xsd webSearch.xsd /CLASSES
Microsoft (R) Xml Schemas/DataTypes support utility
[Microsoft (R) .NET Framework, Version 2.0.50727.42]
Copyright (C) Microsoft Corporation. All rights reserved.
Writing file 'D:\\test\\webSearch.cs'.
Path to XML Help files: C:\Users\Public\Public XPlan AppData\FalconView\config
An example of how to use XML Schema validation: http://support.microsoft.com/kb/307379
An example of reading and writing using XML in C#:
- http://www.c-sharpcorner.com/UploadFile/mahesh/ReadWriteXMLTutMellli2111282005041517AM/ReadWriteXMLTutMellli21.aspx
- http://forum.codecall.net/csharp-tutorials/31315-c-tutorial-reading-writing-xml-files.html#post286608
Generating a schema from an XML file using xsd.exe:
Generating the XML Schema using VB code:
XML serialization with discussion:
XML Tutorial
- self-describing syntax
- first line is XML declaration
- version (1.0)
- encoding (ISO-8859-1...)
- root element
- child elements
<child>
</root></chiuld><subchild>.....</subchild>
- elements
- <root> <child><subchild>textcontent</subchild>
- child is an element of root
- subchild is an element of child
- text content
- <root> <child><subchild>textcontent</subchild>
- attributes
- <book category="COOKING">
- must have closing tags.
- tags are case sensitive
- opening and closing tags
- equal to start and end tags
- must be properly nested
- must have one root element
- all attributes must be quoted.
- entity references
- < < less than
- > > greater than
- & & ampersand
- ' ' apostrophe
- " " quotation mark
- only "<" and "&" are strictly illegal
- XML declaration
- <?xml verison.....?>
- comments in XML
- <!-- comment -->
- new lines are store as line feeds (LFs)
- XML naming rules
- letters, numbers, and other characters
- cannot start with number or punctuation
- cannot start with xml, XML or any combination that spells xml
- cannot contain spaces
- Naming practices
How do I read and write XML in C#?
- attribute
- provides additional info about element
- may want to avoid attributes in XML
- mete data
- data about data
- store as attribute
- data
- store as elements
- DTD
- defines structure of XML
- XML Schema
- defines structure of XML
- In XML errors are not allowed
- can use CSS (Casading Style Sheets) to display info to an XML document
- XSLT is recommended to display XML
- SOAP
- exchanges XML between applications
XML Definition:
What is the format of the XML files we need to read in?
Nice Opensource XML tool:
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