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XML

XML. ”Ett nytt universellt språk för att representera data på webben”. SGML, HTML och XML. SGML. XML. HTML. XSL och CSS. XML-kodad information Dokument. <brev> <adressat> <namn> Johan Johansson </namn> <gatuadress> Storgatan 1 </gatuadress>

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XML

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  1. XML ”Ett nytt universellt språk för att representera data på webben”

  2. SGML, HTML och XML SGML XML HTML

  3. XSL och CSS XML-kodad information Dokument <brev> <adressat> <namn>Johan Johansson</namn> <gatuadress>Storgatan 1</gatuadress> <postadress>123 45 Stockholm</postadress> </adressat> <rubrik>Hejsan! </rubrik> <brevstomme>Med anledning av...</brevstomme> </brev> Johan Johansson Storgatan 1 123 45 Stockholm Hejsan! Med anledning av... Layoutmall kodad enligt XSL eller CSS XSL – eXtensible Stylesheet Language CSS – Cascading StyleSheet

  4. Datamodellen för XML <Adressbok> <Bekant> <Namn>Stina</Namn> <Intresse>Tennis</Intresse> </Bekant> <Bekant> <Namn>Per</Namn> <Intresse>Fiske</Intresse> </Bekant> </Adressbok>

  5. XML Schema <?xml version=”1.0”?> <Schema xmlns=”urn:schema-microsoft-com:xml-data” xmlns:dt=”urn:schemas-microsoft-com:datatypes”> <ElementType name=”Fornamn” content=”TextOnly” /> <ElementType name=”Efternamn” content=”TextOnly” /> <ElementType name=”Bekant” content=”eltOnly” order=”one”> <group order=”seq”> <element type=”Efternamn” /> <element type=”Fornamn” /> </group> </ElementType> <ElementType name=”Adressbok” content=”eltOnly” > <element type=”Bekant” /> </ElementType> </Schema>

  6. Objektet XMLTextReader <%@ Page Language=”VB” %> <%@ Import Namespace=”System.Xml” %> <script runat=”server”> sub Page_Load(obj as object, e as eventargs) dim reader as XMLTextReader try reader = new XmlTextReader(Server.MaphPath (”adress.xml”)) While reader.Read() Response.Write(reader.Name & ” ” & reader.Value & ”<br>” End While catch ex as Exeption Response.Write(”Fel vid inläsning av XML-dokument”) end try end sub </script <html><body></body></html>

  7. Objektet XMLTextWriter dim writer as XMLTextWriter try writer = new XMLTextWriter(c:\temp\adress.xml), nothing) writer.WriteStartDocument writer.WriteStartElement(”Adressbok”) writer.WriteElementString(”Namn”, ”Bo Ek”) writer.WriteEndElement() writer.Flush catch ex as Exception Response.Write(”Error!”) finally writer.Close end try

  8. Validering av XML • Validering med hjälp av Schema dim validator as new XMLValidatingReader(reader) Validator.ValiadationType = ValidationType.XDR • Validering med hjälp av DTDdim validator as new XMLValidatingReader(reader) Validator.ValiadationType = ValidationType.DTD

  9. XML DOM XMLDocumnet XMLNode XML Document Object Model XML-data XMLTextReader XMLTextReader

  10. Hämta XML-data • Via XMLTextReader dim MyXMLDoc as XMLDocument = new XMLDocument() dim reader as new XMLTextReader(”c:\temp\test.xml”) MyXMLDoc.Load(reader) • Direkt från XML-fil dim MyXMLDoc as XMLDocument = new XMLDocument() MyXMLDoc.Load(”c:\temp\test.xml”)

  11. Skapa och modifera XML-data dim eleBook as XmlElement = xml.CreateElement (”Book”) dim attStyle as XmlAttribute = xmldoc.CreateAttribute(”style”) eleBook.SetAttributeNode(attStyle) eleBook.SetAtribute(”style”, ”hardback”) dim root as XmlElement = xmldoc.Item(”bookstore”) Root.AppendChild(eleBook) ------ if node.Name = ”price” then node.Value = ”125” end if

  12. XML och DataSet XML-Fil Databas XmlTextReader ADO.Net (el.dyl.) XmlDataDocument DataSet Validering mm Data binding mm

  13. Övergång: XML till DataSet • Element med attribut blir tabeller • Element med underelement lika så • Element med samma namn blir tabeller • Barn till root-noden blir tabeller Observera: Begränsningar i hanteringen av relationer

  14. Avslutningsvis ”XML will make the web look more like a library and less like a messy heap of books on the floor” R.V. Guha, Netscape

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