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Ther e s a lot m or e t o XML t han t he basic design of an XML docum ent t hat cont ains dat a. This sect ion is designed t o work in concert wit h t he cov er age of XML docum ent form at s and relat ed t echnologies int roduced in Chapt er 6. I n addit ion, t he sect ion pr ovides an ov erv iew of t he k inds of XML- relat ed t asks t hat you can perform from t he .NET Fram ewor k.
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Ther e ar e sev eral dist inguishing feat ures of XML form at s. Tags can be cust om ized for part icular docum ent s. You can r epr esent dat a wit h eit her elem ent s or at t ribut es. All XML docum ent s st art wit h a declarat ion st at ing t he version of XML in t he docum ent .
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These and ot her synt ax feat ures ar e discussed in Chapt er 6 at a lev el sufficient for grasping t he m at er ial in t his chapt er . Scan t he sect ions on XML form at s and schem as t o m ak e sur e t hat y ou hav e an adequat e background for t he m at er ial in t his chapt er . Visit t he Wor ld Wide Web Consort ium sit e ( ht t p: / / www .w3c.org or ht t p: / / www .w3.org) for definit iv e inform at ion on t he lat est XML st andards in t he public dom ain. X M L D ocu m en t s The XML dat a form at w ins praise for m any reasons. One of t he m ost pr om inent for dat abase developers is t he abilit y of XML dat a t o represent hierarchical relat ionships. The st y le for r epresent ing hierarchical relat ionships in XML docum ent s is a dist inct depart ur e fr om relat ional dat a m odels t hat depict hierarchical relat ionships wit h a j oin bet ween t wo or m ore t ables. For exam ple, an XML docum ent can port ray a collect ion of order s wit h t he line it em s, or order det ails, physically wit hin each order. I n t he hierarchical r epresent at ion popular in XML form at s, each r ow from t he Orders t able appears once no m at t er how m any line it em s ar e w it hin an order . A relat ional m odel port rays t he collect ion of orders as a single flat virt ual t able w it h dat a from t he Order Det ails t able m at ching corr esponding dat a from t he Orders t able. I n t he r elat ional represent at ion, ident ical colum n values from t he Orders t able repeat in t he virt ual t able for each line it em w it hin an order. Anot her very im port ant charact er ist ic of XML for m at t ing is t hat it represent s dat a as t ext . This m eans y ou ( and ot her hum ans) can read it w it hout any special t ranslat ions. Prior dat a form at s t ypically used som e k ind of binar y form at t hat m ade t he dat a in t he docum ent less im m ediat ely accessible and also less t ransport able t hr ough corporat e firewalls. Alt hough a rich program m ing m odel is available for pr ocessing XML dat a docum ent s, it is im port ant t o underst and t hat an XML docum ent is j ust t ext . Therefore, it is possible t o dev ise t radit ional t ext parsing t echniques t o ext ract select ed dat a it em s from an XML docum ent . I will dem onst rat e a cust om parsing t echnique lat er in t his chapt er . X M L Sch e m a s I n addit ion t o dat a in XML docum ent s, y ou will oft en work wit h schem as for XML docum ent s. Schem as for XML docum ent s ser ve sim ilar roles t o schem as for dat abases. Nam ely , a schem a describes dat a elem ent s and relat ionships bet ween collect ions of dat a elem ent s. You can use t he .NET Fram ew or k bot h t o help you const ruct new schem as and t o w rit e schem as for ex ist ing docum ent s. This chapt er focuses exclusiv ely on schem as in XSD form at . XSD is t he cur rent st andard for r epr esent ing t he st ruct ur e of a docum ent . When Microsoft first shipped SQL Ser ver 2000, it adopt ed an XDR for m at for designat ing t he st ruct ur e of docum ent s. This is because w hen t he XDR form at was specified, t her e was no universally adopt ed st andard, such as XSD, for r epr esent ing t he st ruct ur e of an XML docum ent . Microsoft published an XSLT st y le sheet for t ransform ing schem as in XDR form at t o corresponding XSD schem as. You can find t his st yle sheet at
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ht t p: / / m sdn.m icr osoft .com / dow nloads/ default .asp url= / downloads/ sam ple.asp u rl= / MSDN- FI LES/ 027/ 001/ 539/ m sdncom posit edoc.xm l. As a .NET dev eloper work ing w it h SQL Serv er, you w ill m ost oft en base y our XML docum ent s on SQL Serv er dat a sources. I n t his case, t he .NET Fram ework can infer a schem a for an XML docum ent fr om t he schem a for t he SQL Ser ver dat a source supply ing values t o t he XML docum ent . I ndeed, you can m anipulat e ADO.NET obj ect s and build indirect ly a DiffGram or XSD schem a from wit hin t he .NET Fr am ew ork. One reason for m anually creat ing y our own schem a is t o cr eat e a st r ongly t yped dat a set . This k ind of dat a set can act as a cust om class except t hat it inherit s t he propert ies, m et hods, and ev ent s for an ADO.NET dat a set . You designat e a schem a at design t im e for t he class t hat defines t he st ruct ur e for t he st r ongly t yped dat a set . Then you can inst ant iat e an inst ance of t he dat a set at any t im e wit h t he sam e New oper at or t hat y ou use for inst ant iat ing ot her obj ect s. You can populat e t he t yped dat a set inst ance wit h a SqlDat aAdapt er obj ect . St r ongly t yped dat a set s offer dist inct advant ages ov er st andard dat a set s t hat .NET builds for y ou. For exam ple, y ou can explicit ly r efer t o colum ns by nam e inst ead of by t heir colum n posit ion w it hin a dat a t able in a dat a set . See t he Work ing wit h a Ty ped Dat aSet t opic and it s links in t he Visual St udio .NET docum ent at ion for m or e det ail on t his t ype of dat a set , inst ruct ions on how t o cr eat e one, and a code sam ple for using one. Annot at ed schem as ar e a special t ype of schem a for designat ing t he st r uct ur e of an XML docum ent while you concurr ent ly specify an ext ernal source for t he st ruct ur e. I nst ead of having t he .NET Fram ew or k im plicit ly build a schem a, y ou can explicit ly creat e one. The Using Annot at ions in XSD Schem as t opic in t he docum ent at ion for Web Release 3 includes m any helpful links for dr illing dow n furt her on m anual t echniques t hat y ou can use t o build annot at ed schem as. A general grasp of t his m at er ial com bined w it h num er ous sam ples t hroughout t he .NET Fr am ew ork docum ent at ion and in t his book can help y ou r ead annot at ed schem as and adapt t hem for cust om ext ensions in y our w ork. Tw o com m on uses for annot at ed schem as in t he .NET Fram ework include basing an XML docum ent on a dat abase and facilit at ing t he nam ing of colum n nam es different ly in an XML docum ent fr om it s underly ing dat a source.
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