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![Xml schema and DTD
DTD SCHEMA
Defines the structure with a
list of defined elements in the
xml document.
<!DOCTYPE note
[
<!ELEMENT note
(to,from,heading,body)>
<!ELEMENT to (#PCDATA)>
<!ELEMENT from
(#PCDATA)>
<!ELEMENT heading
(#PCDATA)>
<!ELEMENT body
(#PCDATA)>
]>
Extension: .dtd
Has only two data types: CDATA
& PDATA
It is an alternative to DTD to define the
structure of an XML document.
<xs:element name="note">
<xs:complexType>
<xs:sequence>
<xs:element
name="to" type="xs:string"/>
<xs:element
name="from" type="xs:string"/>
<xs:element name="heading"
type="xs:string"/>
<xs:element
name="body" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
This definition file is stored with .xsl
extension.
Can have primitive and complex data
types.](https://image.slidesharecdn.com/xmlschema-161202180359/75/Xml-schema-9-2048.jpg)
Uploaded byAkshaya Akshaya
Xml schema
XML Schema defines rules for encoding documents in a machine-readable format. It allows data exchange between systems independently of programming languages. XML Schema defines elements, attributes, and data types to structure XML documents. It provides more data typing capabilities than DTDs. Namespaces are used to avoid element name conflicts between different XML vocabularies. User-defined types can restrict built-in types or create new complex types from simple types to structure application-specific data.
More Related Content
Xml schema
- 1.
- 2. WHAT IS XML? Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a formatwhich is both human- readable and machine-readable XML was designed to carry data, not to display data
- 3. XML HTML Usedto carry data Can create own tags Platform independent and language independent Tags and attributes are case sensitive & must be quoted XML elements must be properly nested All XML elements must have a closing tag XML is used to create new internet languages. Here are some examples: ◦ WSDL for describing available web services ◦ WAP and WML as markup languages for handheld devices ◦ RSS languages for news feeds ◦ RDF and OWL for describing resources and ontology ◦ SMIL for describing multimedia for the web Used to display data Cant create own tags Not language independent Tags are not case sensitive & quotes is not complusory
- 4. WHERE AND WHYXML? SCENARIO A web service client or server written in java must convert between its internal representation of data and character strings appropriate for representing the data in a SOAP document(or any kind of doc used for displaying the data in the web) Eg: Currency convertor From dollars : web service has to convert the java double value to represent the amount in string
- 5. Contd.. What wouldbe the constraints in this process?? Data range decision Value constraints Usage of scientific notation Precision issues and etc..
- 6. Solution??? XML SCHMEA(XML VOCABULARY): It has a definition of collection of standard data types. It has the range of values that could be used for a particular data type and then datas on how to represent the values
- 7. XML SCHEMA WELLFORMED XML DOCUMENT XML with correct syntax is "Well Formed" XML. XML validated against a DTD is "Valid" XML. Example for XML Document <?xml version="1.0" encoding="ISO-8859-1"?> <note> <to>Tove</to> <from>Jani</from> <heading>Reminder</heading> <body>Don't forget me! </body> </note>
- 8. XML ELEMENT & VOCABULARY XML Element An XML element is everything from (including) the element's start tag to (including) the element's end tag. An element can contain: other elements text attributes Or a mix of all of the above... XML vocabulary XML vocabulary is used to define element and attribute names element content Semantics of elements and attributes Some of the xml vocabularies are XHTML, RSS, XSL, DTD, and Schema
- 9. Xml schema andDTD DTD SCHEMA Defines the structure with a list of defined elements in the xml document. <!DOCTYPE note [ <!ELEMENT note (to,from,heading,body)> <!ELEMENT to (#PCDATA)> <!ELEMENT from (#PCDATA)> <!ELEMENT heading (#PCDATA)> <!ELEMENT body (#PCDATA)> ]> Extension: .dtd Has only two data types: CDATA & PDATA It is an alternative to DTD to define the structure of an XML document. <xs:element name="note"> <xs:complexType> <xs:sequence> <xs:element name="to" type="xs:string"/> <xs:element name="from" type="xs:string"/> <xs:element name="heading" type="xs:string"/> <xs:element name="body" type="xs:string"/> </xs:sequence> </xs:complexType> </xs:element> This definition file is stored with .xsl extension. Can have primitive and complex data types.
- 10. DATA TYPES INXML SCHEMA DATA TYPES SIMPLE PRIMITIVE(BUILT- IN) USER DEFINED COMPLEX PRIMITIVE(BUILT- IN) USER DEFINED
- 11. A quick comparison.. SIMPLEDATA TYPE Values are represented in xml doc by character data Used to represent individual values COMPLEX DATA TYPE Values are represented using mark up. Used to represent structured data(highly organised).
- 12. Built in datatype.. Simplebuiltindatatypes The data types defined by xml schema specification itself are called built-in data types. Eg: <latitude xsi:type=“xsd:decim al”>40.28</latitude> Xsd decimal is a reference to XML schema Xml schema type is similar to java ‘s primitive types. Except for boolean XML schema types appear as type and message elements. Within types, user defined data types are the building blocks for user-defined types. Within message elements built in types are used to declare data type for an operation parameter or return value.
- 13. XML NAMESPACES Itis a collection of element and attributes names associated with an XML vocabulary. XML Namespaces provide a method to avoid element name conflicts. doc1 • <table> <tr> <td>Apples</ td> <td>Bananas </td> </tr> </table> Doc 2 •<table> <name> Coffee Table</name> <width>80</widt h> <length>120</le ngth> </table> Namespace usage • <h:table> <h:tr> <h:td>Apples</h:td > <h:td>Bananas</h: td> </h:tr> </h:table> <f:table> <f:name>African Coffee Table</f:name> <f:width>80</f:width > <f:length>120</f:len gth> </f:table>
- 14. USER DEFINED TYPES.. USER DEFINED SIMPLE TYPES <simpleType name=“memberType”> <restriction base=“string”> <enumeration value=“platinum”/> <enumeration value=“gold”/> </restriction> </simpleType> Facets of simple data type: length,minlength,maxlen gth USER DEFINED COMPLEX TYPE <anExchangeValue xsi:type=“ExchangeVal ues”> <dollars>1.0</dollars> <euros>0.7468</euros > </anExchangeValue>
- 15.