XPath support, XPath Builder | IBM Version 5 specs

5.4 XPath support

XPath is an XSL sub-language that is designed to be used with XSLT. It is used for identifying or addressing parts of a source XML document. Every node within an XML document can be uniquely identified and located using the syntax defined for XPath.

WebSphere Application Developer provides support for XPath. To launch the XPath Builder

Move to the XML perspective.

Choose an XML file in your project.

Right-click, and select Generate —>XPath.

Figure 5-9 XPath Builder

In order to define your XPath, the Application Developer provides you with means for defining all the necessary constructs. Look at Figure 5-10. After you choose the desired node in your XML tree, you will need to provide the steps for the location paths. Although location paths are not the most general grammatical construct in the language, they are the most important construct. A location path selects a set of nodes relative to the context node. The result of evaluating an expression that is a location path, is the node-set containing the nodes selected

92 The XML Files: Development of XML/XSL Applications Using WebSphere Studio

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IBM Version 5 manual XPath support, XPath Builder

Contents

XML Files Page International Technical Support Organization First Edition December Contents XML Collection Contents Part 4. Appendixes Abbreviations and acronyms Page Copyright License Trademarks Cics Preface Team that wrote this redbookPage Become a published author Comments welcomePage Part Page XML overview XML concepts Background XML business benefits Information sharing XML within an organization Technical benefits of XML XML in new innovationsVoice XML Scalable Vector Graphics Acceptability of use for data transfer Uniformity and conformitySimplicity and openness Separation of data and display XML history ExtensibilityIndustry acceptance XML1.0 Xslt and Web applications Web Tier Web services and XML Interaction of Web services XML, W3C, and IBM Recommendations Working drafts in developmentPage Technologies in XML XML Processor parser Tree-based parsing DTD and XML Schema Event-based parsingPage Schema and style using CSS, XSLT, and XSL Cascading Style Sheet CSS XML namespaces Example 2-1 a namespace example Example 2-2 a namespace example using namespace prefix Link and jump using XLink, XPointer, and XML Base Example 2-3 a simple link Example 2-4 An extended link Example 2-5 An example of extended links using xbase XML Base XML Pointer XPointer paths and steps XPointer range functions XPointer string functions XPath Example 2-6 An XPath example XML digital Book Library Technologies in XML Examples of XML encryption Example 2-7 Information on passenger John SmithExample 2-8 Encrypted Information on passenger John Smith Example of a XML digital signature Example 2-9 Encrypting only the credit card numberExample 2-10 Encryption of the whole document Transforms Example 2-11 An XML digital signatureExample 2-12 Part encryption of an XML document Example 2-13 The final XML document after encryption Other security specifications XML query language Path expressions Element constructors FLWRFOR, LET, Where and Return clauses expression Conditional expressions if then Else Quantifiers Filtering Example schema for relational database and Xquery comparison Querying relational data Grouping in XQuery Joins Xslt compilers Xsltc Xslt interpreters For more details, visit Using XSLTCThe Apache XML Project at Java Architecture for XML Binding Jaxb Cocoon Generators and reader pipeline inputs Transformers and actions processing stepsSerializer pipeline outputs Matchers and selectors conditional processing SitemapExample 2-14 Sample sitemap for Cocoon Example 2-15 Components of a sitemap XML file Part 2 XML technology in IBM WebSphere Page Processing XML XML applications Xalan Xalan model of operation SAX2 Javax.xml.transforms interfaces operation Example 3-1 Sample XML document Example 3-2 Sample event breakdown SAX2 classes and interfaces XML namespace support Example 3-3 SAX2 callback methodsExample 3-4 Sample namespace DOM level2 DOM hierarchy Example 3-5 Sample XML document Sample generated DOM tree Jaxp Using Jaxp Example 3-6 Sample XML to Html transformation code Xslt support packages in Jaxp Stylesheet compilation Introduction to IBM WebSphere Application Developer WebSphere Studio product family WebSphere Studio family WebSphere Studio Site Developer Advanced WebSphere Studio Application Developer WebSphere Studio Application Developer Integration Edition WebSphere Enterprise Developer Tools Web development tools Relational database tools XML tools Web services development tools Java development tools EJB development tools Team collaborationDebugging tools Server tools for testing and deployment Performance profiling tools Plug-in development tools Plug-in projectFragment project Plug-in component Application Developer XML Tools XML perspective Window-Open Perspective-XML XML perspective editors XML editorCreating an XML file from scratch Select the option Create XML file from scratch Editing an XML file XML editor DTD editor Validating the XML fileCreating a DTD from scratch Using the Outline view to add DTD components DTD Editor Creating a schema from scratch XSD editorValidating DTD Using the Outline view to add schema components XML Schema Editor Pop-up on schema file in the Outline view Making changes and referential integrity Validating schema Namespace XSL editor Creating an XSL file from scratch Namespace support Editing an XSL fileValidating the XSL file Indicate all local elements to be qualified XPath support XPath Builder 10 XPath definition 11 XPath Operators 12 XPath functions XSL debugger 13 XPath Query Result screen 14 XSL Debugger Web services support Web Service Dadx group configuration wizardWeb service wizard Application Developer XML Tools Page RDB and XML integration 101 SQL to XML wizards Passenger List Select statement SQL to XML wizard panel Show table column as option XML and XSL filesExample 6-1 XSL file for Show table columns as ‘Elements’ Html XML file generated with the Elements option Html file Html with the ‘Recurse through foreign keys’ unchecked Html generated for Foreign key as links option XML Schema file Aircraft Html generated for ‘Foreign key as links’ option RDB and XML integration 076/schema Sequence Example 6-4 XML Schema for Aircraft table DTD file Page Query template file Flight Cdata #REQUIRED Statement Options XML to SQL wizard Example 6-9 Customer.xml XML to SQL wizard Selecting the connection 10 XML to SQL wizard Selecting Schema and Action DDL to XML Schema wizard 11 XML to SQL wizard Selecting the column 12 Generate XML Schema Example 6-10 XML Generated through the DDL to XML Schema Restriction base=string length value=30 SimpleType Element Example 6-11 XML Schema for a single table using a Select DB2 XML Extender XML Extender 13 shows an overview of the XML Extender Administrative support tables, UDTs, and UDFs Administrative support tables createdUDTs created Stored Procedures created UDFs created DTD Repository Document Access Definitions DAD Example 6-12 DTD representation of a bookPage When to use XML Column method XML Column method Elements/attributes As is xml documentXML Collection When to use XML Collection method 15 XML Collection Method overview Mapping schemes for XML collections Example 6-14 Sample DTD SQL mapping Employee table in Sample database Column name Data type Empact Table in Sample database RDBnode for the top elementnode Example 6-16 The RDBnode XML Extender administration tools RDBnode for each attribute and textnodeExample 6-17 RDBnode mapping XML MQSeries enablement RDB and XML integration Page 145 Select passengerList.dtd Right-clickGenerate-XML Schema DTD XSDClick Finish XML DTD/XSD Create an XML file from a DTD file Create an XML file from an XSD file Create DTD/XSD files from XML Select Select file from Workspace optionSelect passengerList.xsd Right-clickGenerate-XML File Example 7-1 Customer.xml Select Customer.xml Right-clickGenerate-XML Schema Select customer.xml Right-clickGenerate-DTDExample 7-2 Customer DTD Generate a Html from an XSD Select passengerList.xsd file Right-clickGenerate-HTML DocExample 7-3 Customer.xsd JavaBeans from DTD/XSD Click File-New-ProjectSelect J2EE Web Application Project. Click Next Generate XML/XSL from JavaBeans Select passengerList.xsd Right-clickGenerate-JavaBeansSelect Generate sample test program. Click Finish Example 7-4 passenger.javaPage Click File-New-Java Bean XML Client Input XML Form screen Generate XML/XSL from Html Click File-New-Other Preparing the Html file for generation Adding annotation tags Example 7-5 cus-template.xhtml Select cus-template.xhtml Right-clickGenerate-XSL File Select Customer.xhtml. Click NextExample 7-6 Customer.xml Page Part 3 XML application development 161Page WebSphere and XML approaches 163 XML in Application development Web services Passenger List application Solution Outline Web Services ServletXML in this application Client Web Tier Technical implementation overview Development and running of the Passenger List applicationPage Advantages of using the database Discussion Enterprise JavaBeans Interprise Application Server Customer Registration application Technical overview Page Developing XML Web services 177 Creating the Web tier Servlet Create the Airline simple project Name Type Design the XML Schema Select File-New-XML SchemaCreate the Travel Web project Select root node PassengerList DOM Tree Creating XML Schema XML Schema Example 9-1 PassengerList.xsd Generate XML file Design an outputHtml and mapping approach Example 9-2 Static XML file Select required and optional content, click Finish Example 9-3 html.dtdExample 9-4 html.xml source Generate an XSL file XML to Html mapping Mapping XML to Html Source Target Create an XSL from scratch Generating XSL from Xhtml Testing the XSL Developing the servlet Javax.xml.transform.Source Example 9-5 GetPassengerList Server doGet method Test the passenger list application Compiling XSLJavax.xml.transform.TranfrormerFactory Javax.xml.transform.Transformer Creating a Web service 11 XML Web service Create the database tier Click Window-Open Perspective-DataRight-clickNew Connection Right-clickImport to folder Generate DTD file PassengerList.xsd-Generate-DTD Figure Loading DTD into XML Extender 13 Generated DTD File Creating DAD file using RDB to XML mapping MembershipSelect RDB Table to XML Mapping, click Next Click Mapping-Edit Join Conditions 15 Edit Join Conditions Select passengerList.rmx 16 RDB to XML mapping Create the Web Service from Dadx file DAD Extension Web services and DB2 XML Extender Dadx Group Group.properties File Generating the Dadx Next Dadx operations 18 Dadx Generation RetrieveXML Deploying the Web service Example 9-6 Updated Dadx fileStoreXML 19 Web Service settings Example 9-7 namspacetable mapping entry Test the Web Service 20 Testing Web Service Modify passenger list application to use the Web Service Mapping DTDIDs to XSD namespaces and locations Modifying the XSL file Example 9-8 NamespacesExample 9-9 Changing root element Example 9-10 passengerList.xslPage Creating Html input form Center Using Java proxy 22 Input form GetPassengerList.html Conclusion 23 passengerList resultPage Development of XML-based Enterprise applications 215 Multi-tier solution architecture XML based Enterprise application architecture Solution outline for customer registration sample Customer registration Retrieving customer information Customer registration scenario outline Developing the customer registration sample Retrieving customer data scenario outline Preparing to create the Web tier JavaBean to XML client wizard Customer JavaBean class specification Creating the Web tier JavaBean XML/XSL client wizard JavaBean XML/XSL client JavaBean selection JavaBean XML/XSL client methods and properties selection JavaBean XML/XSL client input form design 10 JavaBean XML/XSL client results form design 11 JavaBean XML/XSL client prefix specification Investigating the Web-tier generated filesPage ProduceDOM Document Org.w3c.dom.DocumentJava Bean XML Data Example 10-2 Source code for CustomerXSLServlet init method Development of XML-based Enterprise applications ProduceDOMDocument XML DocumentXslt Processor Stylesheet Transformer Example 10-4 Source code for the servlet doPost method Form action=/Registration/CustomerXSLServlet method=post Membership Example 10-10 Sample of CustomerResult stylesheet form Example 10-12 Schema file for the XML data Validating the Web tier Building the entity EJB and the database schema 15 Customer registration form Project configuration EJB mapping approaches reviewPreparing to create the entity EJB Creating the entity EJB 17 Create an Enterprise Bean wizard Creating the database mapping and tables 18 Enterprise bean details 19 EJB to RBD Mapping wizard for CustomerInfo module 20 Target database specification 21 EJB to RDB mapping editor Access beans 22 Database connection definition Creating an access bean for the entity bean 23 Access Bean creation wizard Creating a Jdbc data source 24 Data source definition for a server configuration Binding the EJB to a Jdbc data source 25 Jdbc data source definition Integrating the entity EJB with the Web tier Modifying CustomerXML 27 CustomerInfoWeb project properties Example 10-13 create source code Modifying CustomerXSLServlet Example 10-14 CustomerXSLServlet doPost source code Application deployment and testing Retrieval functionExample 10-15 Retrieval function Example 10-16 Confirming the creation Testing the registration application 28 Generating the deployed code for the EJB 29 Customer Registration form Page Light weight XML-based Enterprise Application 257 SQL-XML solution architecture SQL to/from XML libraries Light weight XML-based Enterprise Application Customer registration Retrieving customer information XSL Servlet Adding the libraries to the project XML Document format XMLToSQL architecture Converting an XML Document Modifying CustomerXSLServlet Initializing the XMLToSQL classXMLToSQL Creating an XML Document Modifying the produceDOMDocument methodExample 11-1 initSQLProperties method We need to change to Example 11-2 ProduceDOMDocumentforTools Executing the XMLToSQL class Example 11-3 CustomerXSLServlet doRegister method Modifying the doPost method Example 11-4 CustomerXSLServlet doPost methodExample 11-5 The xslif tag Adding the error case Example 11-6 Customer.XSL firstname template Retrieving a customer JdbcDriverStatement Format Initializing the SQLToXML class SQLToXMLExample 11-7 initQueryProperties method Executing the SQLToXML class Example 11-8 CustomerXSLServlet doQuery method Modifying the showPage method Example 11-9 CustomerXSLServlet doPost method for queryExample 11-10 showPage method Modifying the doGet method Example 11-11 showPage methodExample 11-12 Customer.XSL membership template Example 11-13 Result XSL Page Using datasource with SQLToXML and XMLToSQL class Customer Registration form Class definition Getting the datasource Constructors Example 11-14 setDatasourceMethodsExample 11-15 setDatasourceMethods Execute methods Conclusion 11 Core data is an XMLPage Deploying your Web application 283 Manual deployment Exporting your project from Application Developer Installing the EAR file on WebSphere AEs Starting the WebSphere AEs Admin Console Installing the EAR Select Enterprise Applications Testing the application Publishing to a remote server AEs Creating a remote server instance Creating a remote server instance WebSphere Studio Application Developer Programming Guide Remote server instance settings Remote file transfer option Remote copy options WebSphere Studio Application Developer Programming Guide Publishing to remote server WebSphere Studio Application Developer Programming Guide Part 4 Appendixes 297Page 299 Things to do before installation Installing Application Developer WebSphere Studio Application Developer installation Selecting your workspace Select options Verifying the installation Programs-IBM WebSphere Studio Application Developer-IBM WebSphere Studio Application Developer Programming Guide 305 Hardware and software prerequisites Create groups and users Install WebSphere Application Server Check that IP ports are unusedStop the Web server processes 10 Installation options 11 Security options 12 Snoop servlet accessed through embedded Web server Using the Web material Locating the Web material311 How to use the Web material System requirements for downloading the Web material Abbreviations and acronyms 313 OTS IBM Redbooks Referenced Web sitesOther resources 315 How to get IBM Redbooks IBM Redbooks collections Index 317 Jaxp Wsaa Xacml Xsltc 48 Spine 475-0.875 250 459 pages Page Page XML Files