- XML - eXtensible Markup Language .xml
- XSLT - eXtensible Stylesheet Language Transformations .xsl
- XSD - XML Schema Definition
- DTD - Document Type Definition
- DOM - Document Object Model
- AJAX - Asynchronous JavaScript And XML
- WSDL - Web Services Description Language
- SOAP - Simple Object Access Protocol
- RSS - Really Simple Syndication
- XMLNS - Xml NameSpace
- XHR - XmlHttpRequest
- XML Does Not DO Anything
- XML was designed to store and transport data.
- XML was designed to be both human- and machine-readable.
- XML was designed to carry data - with focus on what data is
<!-- Comment -->
<element></element>
<element />
<gangster name='George "Shotgun" Ziegler'>
<gangster name="George "Shotgun" Ziegler">- File Extention = .xml
- Internet media-type = application/xml text/xml
- XML documents must have a root element
- XML elements must have a closing tag
- XML tags are case sensitive
- XML elements must be properly nested
- XML attribute values must be quoted
<root>
<child>
<subchild>.....</subchild>
</child>
</root><!-- XML Elements vs. Attributes -->
<!-- WAY 1 -->
<note date="2008-01-10">
<to>Tove</to>
<from>Jani</from>
</note>
<!-- WAY 2 -->
<note>
<date>2008-01-10</date>
<to>Tove</to>
<from>Jani</from>
</note>
<!-- WAY 3 -->
<note>
<date>
<year>2008</year>
<month>01</month>
<day>10</day>
</date>
<to>Tove</to>
<from>Jani</from>
</note>- AJAX is not a programming language.
- AJAX is a technique for accessing web servers from a web page.
- The keystone of AJAX is the XMLHttpRequest object.
- The XMLHttpRequest object is used to exchange data with a server.
- AJAX can be used for interactive communication with an XML file.
- AJAX is a misleading name. AJAX applications might use XML to transport data, but it is equally common to transport data as plain text or JSON text.
function loadDoc() {
var xhttp;
if (window.XMLHttpRequest) {
// code for modern browsers
xhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
// Old Versions of Internet Explorer
xhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xhttp.onreadystatechange = function() {
// readyState Holds the status of the XMLHttpRequest.
// 0: request not initialized
// 1: server connection established
// 2: request received
// 3: processing request
// 4: request finished and response is ready
// status
// 200: "OK"
// 403: "Forbidden"
// 404: "Page not found"
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML = this.responseText;
}
};
// HEADER
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
// setRequestHeader(header, value) Adds HTTP headers to the request
// header: specifies the header name
// value: specifies the header value
xhttp.open("GET", "data.txt", true);
// open(method, url, async)
// method: the type of request: GET or POST
// url: the server (file) location
// async: true (asynchronous) or false (synchronous)
xhttp.send();
// send() Sends the request to the server (used for GET)
// send(string) Sends the request to the server (used for POST)
}- The DOM defines a standard for accessing and manipulating XML documents
- The XML DOM is a standard for how to get, change, add, or delete XML elements.
- A standard object model for XML
- A standard programming interface for XML
- Platform- and language-independent
- PCDATA - Parsed Character Data.
- CDATA - Character Data
-
An XML Schema describes the structure of an XML document.
-
XML Schema is an XML-based (and more powerful) alternative to DTD
-
XML documents can have a reference to a DTD or to an XML Schema.
-
XS-SCHEMA
- XS-ELEMENT
- XS-ATTRIBUTE
- XS-ELEMENT
-
name (lang), type (xs:string) , default, fixed, use (required, optional)
-
XML Schema has a lot of built-in data types. The most common types are:
- xs:string
- xs:decimal
- xs:integer
- xs:boolean
- xs:date
- xs:time
<?xml version="1.0"?>
<not xmlns="https://www.w3schools.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://www.w3schools.com/xml note.xsd">
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note><?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<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>
</xs:schema>- WSDL, SOAP, RDF, and RSS
An WSDL document describes a web service. It specifies the location of the service, and the methods of the service, using these major elements
<types>Defines the (XML Schema) data types used by the web service<message>Defines the data elements for each operation<portType>Describes the operations that can be performed and the messages involved.<binding>Defines the protocol and data format for each port type
Skeleton of WSDL file
<definitions>
<types>
data type definitions........
</types>
<message>
definition of the data being communicated....
</message>
<portType>
set of operations......
</portType>
<binding>
protocol and data format specification....
</binding>
</definitions>SOAP provides a way to communicate between applications running on different operating systems, with different technologies and programming languages.
- SOAP is an application communication protocol
- SOAP is a format for sending and receiving messages
- SOAP is platform independent
- SOAP is based on XML
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2003/05/soap-envelope/"
soap:encodingStyle="http://www.w3.org/2003/05/soap-encoding">
<soap:Header>
...
</soap:Header>
<soap:Body>
...
<soap:Fault>
...
</soap:Fault>
</soap:Body>
</soap:Envelope>- Notepad++ plugin : https://community.notepad-plus-plus.org/topic/16983/xml-tools/4
- https://www.w3schools.com/xml/default.asp
- https://en.wikipedia.org/wiki/XML
- https://en.wikipedia.org/wiki/List_of_XML_markup_languages
- https://www.tutorialspoint.com/xml/index.htm
- https://www.tutorialspoint.com/wsdl/wsdl_types.htm
- https://www.tutorialspoint.com/xsd/index.htm
- https://www.tutorialspoint.com/xslt/index.htm
- https://www.tutorialspoint.com/xpath/index.htm
- https://www.tutorialspoint.com/xquery/index.htm