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 F u n c t i o n :   i s M a r k u p ( s t r i n g ) 
 
 
 
 D e s c r i p t i o n :   C h e c k s   i f   a   s t r i n g   c o n s i s t s   o f   H T M L   o r   X M L   m a r k u p . 
 
 
 
 R e t u r n s :   T r u e   i f   y e s ,   F a l s e   o t h e r w i s e . 
 
 
 
 N o t e :   T h e   i s M a r k u p ( )   f u n c t i o n   d o e s   n o t   s u p p o r t   c h a i n i n g . 
 
 
 
 E x a m p l e : 
 
 
 
 / /   C h e c k   i f   a   s t r i n g   c o n s i s t s   o f   H T M L   o r   X M L   m a r k u p 
 
 
 
 v a r   i s M a r k u p   =   $ A . i s M a r k u p ( ' T h i s   i s   a   t e s t . ' ) ;   / /   R e t u r n s   f a l s e 
 
 
 
 v a r   i s M a r k u p   =   $ A . i s M a r k u p ( ' < b > T h i s   i s   a   t e s t . < / b > ' ) ;   / /   R e t u r n s   t r u e 
 
 