xml part-5

 xml part-5

xml part-5
xml part-5

 


Internal and External entities       
यदि entity DTD में ही declare की गई है तो वह internal entity कहलाती है। Internal entities general भी हो सकती है तो parameter entities भी हो सकती है। 

यदि entity को DTD के बाहर किसी दूसरे document में declare किया गया है तो ऐसी entity external entities कहलाती है। इन entities को access करने के लिए entity के नाम के बाद SYSTEM attribute में उस file का URL दिया जाता है जिसमें entities declare की गई है। इसका structure निचे दिया जा रहा है।     

 
Notations 
हर entity को XML processor process नहीं कर सकता है इसके लिए एक specific application की जरुरत पड़ती है। जैसे की images के लिए एक image viewer की आवश्यकता होती है। 

Notation basically एक mechanism होता है जिसमे वो सभी entities जो process नहीं की जा सकती उनको एक specific entity के साथ जोड़ दिया जाता है। एक notation declare करना बहुत ही आसान होता है। इसके लिए tag यूज़ किया जाता है। इसका structure निचे दिया जा रहा है। 
      
यँहा पर entity-identifier entity का नाम होता है।

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