Xml
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This document provides an overview of XML (eXtensible Markup Language). It defines XML as a meta markup language for representing text documents and data. XML allows users to define their own tags to represent different types of information. The document discusses how XML documents form a tree structure with a root element and nested elements. It also covers XML syntax rules and parsing methods like SAX and DOM that can be used to read and manipulate XML documents.
Xml
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 3. XML Zabeeb Anwar zabeebanwar@gmail.com www.facebook.com/zabeeba nwar twitter.com/zabeebanwar in.linkedin.com/in/zabeeb +919895599689
- 4. XML • eXtensible Markup Language • XML is a meta markup language for text documents / textual data. • XML allows to define languages (applications) to represent text documents / textual data
- 5. XML EXAMPLE <article> <author>Gerhard Weikum</author> <title>The Web in 10 Years</title> </article> • Easy to understand for human users • Very expressive (semantics along with the data) • Well structured, easy to read and write from programs
- 6. THIS IS ALSO XML <data> ch37fhgks73j5mv9d63h5mgfkds8d984lgnsmcns983 </data> • Impossible to understand for human users • Not expressive (no semantics along with the data) • Unstructured, read and write only with special programs
- 7. • The actual benefit of using XML highly depends on the design of the application.
- 8. Quick Comparison XML uses tags and attributes HTML uses tags and attributes - content and formatting can - content and format are be placed together separate; formatting is <p><font=”Arial”>text</font> contained in a stylesheet - tags and attributes are pre- - allows user to specify what determined and rigid each tag and attribute means
- 9. XML schema • The purpose of an XML Schema is to define the legal building blocks of an XML document, just like a DTD. • An XML Schema: – defines elements that can appear in a document – defines attributes that can appear in a document – defines which elements are child elements – defines the order of child elements – defines the number of child elements – Etc.
- 10. XML Documents Form a Tree Structure • XML documents must contain a root element. This element is "the parent" of all other elements. • The elements in an XML document form a document tree. The tree starts at the root and branches to the lowest level of the tree.
- 11. XML Syntax Rules • All XML Elements Must Have a Closing Tag • XML Tags are Case Sensitive • XML Elements Must be Properly Nested • XML Documents Must Have a Root Element • XML Attribute Values Must be Quoted • White-space is Preserved in XML
- 12. • What is a parser? – A program that analyses the grammatical structure of an input, with respect to a given formal grammar
- 13. • <article> <author>Gerhard Weikum</author> <title>The Web in 10 Years</title> </article> Easy to understand for human users Very expressive (semantics along with the data) Well structured, easy to read and write from programs
- 14. What is a XML Parser? • It is a software library (or a package) that provides methods (or interfaces) for client applications to work with XML documents • It checks the well-formattedness • It may validate the documents • It does a lot of other detailed things so that a client is shielded from that complexities
- 15. • We will consider two parsing methods SAX = Simple API for XML DOM = Document Object Model
- 16. SAX • XML is read sequentially • When a parsing event happens, the parser invokes the corresponding method of the corresponding handler
- 17. DOM • Parser creates a tree object out of the document • User accesses data by traversing the tree – The tree and its traversal conform to a W3C standard • The API allows for constructing, accessing and manipulating the structure and content of XML documents
- 18. Glade XML Structure • It represents an `instantiation' of an XML interface description. When object is created, the XML file is read, and the interface is created. • The GladeXML object then provides an interface for accessing the widgets in the interface by the names assigned to them inside the XML description. • The GladeXML object can also be used to connect handlers to the named signals in the description. • Libglade provides an interface by which it can look up the signal handler names in the program's symbol table and automatically connect as many handlers up as it can.
- 19. GladeXML Object Hierarchy GObject +---- GladeXML typedef struct { GObject parent; char *filename; } GladeXML;
- 20. GladeXMLClass typedef struct { GObjectClass parent_class; /* Virtual function: gets the appropriate gtype for the typename.*/ GType (* lookup_type) (GladeXML*self, const char *gtypename); } GladeXMLClass;
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