Master


'


s Thesis 2006 


FACHHOCHSCHULE


HOCHSCHULE F


U


R


LI Hui 


STUTTGART


TECHNIK


Background 


        STUTTGART UNIVERSITY OF APPLIED 


SCIENCES 


corresponding  style  parameters  are  also  defined.  Furthermore,  another  command 


path


  is  provided  to  describe  lines  and  curves  between  points.  Additionally 


transformations, masking, linking, temporal effects and animation are also possible. 


SVGT is XML based graphics, the source code for SVGT graphic  is not held  in any 


arbitrary text format, but an SVGT image or an SVGT document is a 


well formed


XML document. A well formed SVGT document might have a structure which could 


look like this: 


 


Error!




        "http://www.w3.org/TR/2001/REC SVG 20010904/DTD/svg10.dtd">             


 


         


 


Listing 3: 


The format of GetMap request in a URL


The first line of the SVGT file header is the standard XML processing instruction that 


efficiently  states  that  this  document  conforms  to  the  XML  1.0  specification,  uses 


UTF 8  character  encoding  and  depends  on  a  Document  Type  Definition  (DTD) 


external  to  the  document  to  parse  correctly.  Following  that  might  be  a  DOCTYPE 


declaration that provides information to the SVGT rendering engine (also called SVG 


viewer)  about  what  structure  to  expect  in  the  SVGT  document.  The 


DOCTYPE


states  where  the  DTD  is  located  and  the  name  of  the  document  element  it  will  be 


applied to. In this case, the DTD is applied to a document element name 


svg


. In the 


DOCTYPE declaration,   


"http://www.w3.org/TR/2001/REC SVG 20010904/DTD/svg10.dtd"


Listing 4: 


DTD in the DOCTYPE declaration


Listing  4  is  the  URL  for  the  file  that  defines  the  allowable  structure  of  an  SVGT 


document, for example the grammar and rules for the document. More specifically, an 


SVGT  document  also  must  be 


valid


.  In  XML  terminology,  that  means  the  SVGT 


image  must  be  structured  in  the  way  demanded  by  the  Document  Type  Definition 


14 






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