XPa t h Qu e r ie s in VB.NET

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XPa t h Qu e r ie s
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XPat h is a language t hat perm it s y ou t o addr ess t he part s of an XML docum ent . You can use XPat h t o query an XML docum ent m uch as y ou use SQL t o query a dat abase. An XPat h query ex pression can select on docum ent part s, or t ypes, such as t he docum ent s elem ent s, at t r ibut es, and t ext . You can select nodes for ancest ors, descendant s, and siblings of a specified docum ent t ype. An ancest or is a t ype t hat cont ains t he cur rent t ype. For exam ple, an order is t he ancest or of an order det ail it em . Conv ersely, a descendant is cont ained w it hin t he cur r ent t ype. Each t ype t hat y ou use for select ion in an XPat h query can r et urn a set of nodes. These nodes cor respond generally t o t he r ows in t he r esult set fr om a SQL st at em ent , but t he sy nt ax for designat ing XML docum ent t ypes wit h an XPat h query is ent irely differ ent from t radit ional SQL synt ax. You can use SQLXML Managed Classes t o form ulat e and ex ecut e XPat h queries. You can ev en m ak e t he query st at em ent s dynam ic at r un t im e. The set of nodes ret ur ned by an XPat h query is cont ained in an Xm lNodeList obj ect . The .NET Fram ew ork enables Visual Basic dev elopers t o it erat e t hr ough t he nodes wit hin a node list t o exam ine t he r esult from an XPat h query expr ession. Sev er al sam ples t hr oughout t he balance of t his chapt er dem onst rat e t he synt ax for perform ing t his k ind of t ask. See Chapt er 6 for addit ional cov erage of t he XPat h language and addit ional resources for learning m ore about it .
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XSLT perm it s t he progr am m at ic t ransform at ion of files in XML form at t o var ious ot her form at s. XSLT has m any pot ent ial applicat ions, but t his book dr ills dow n on t he capabilit y of XSLT t o t ransform raw XML files int o HTML t ables on Web pages. You can specify an XSLT t ransform at ion w it h SQLXML Managed Classes from wit hin a .NET applicat ion. The .xslt file ex ist s as a separat e file, and t he .NET applicat ion can refer t o t he .xslt file as a pr oper t y set t ing for t he SqlXm lCom m and obj ect . An .xslt file can cont ain st yle sheet elem ent s, HTML code, and pr ocessing inst ruct ions for ext r act ing cont ent fr om an XML docum ent . An .xslt file is t he k ind of file t hat a Web dev eloper is m ore likely t o const ruct t han a t ypical Visual Basic dev eloper. Wit h sufficient for et hought and collaborat ion, t he Web dev eloper can prepare a set of st andar d .xslt files for r euse by Visual Basic dev elopers. Giv en t he ex ist ence of an .xslt file, a Visual Basic dev eloper can r eadily reference it t o for m at dat a for a Web page. That is, a Visual Basic program can dir ect ly creat e an HTML file w it h t he help of an .xslt file. A Visual Basic dev eloper can use t he SqlXm lCom m and class t o ext ract rows in XML form at from a SQL Ser ver dat a source and t hen assign a propert y set t ing t o t he SqlXm lCom m and class inst ance t hat enables t he form at t ing of r ows for display on a Web page as an HTML t able. The Web page w ill be st at ic. How ev er , by let t ing users inv ok e t he pr ogram t o creat e t he st at ic page, t he .NET Fram ew or k can perm it t he cr eat ion of cont ent in Web form at on dem and.
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