Another PillowTalk Presentation  2004 Dynamic Systems, Inc. Introduction to XML for SOA Lee H. Burstein, President 2525 Justin Lane Wilmington, DE

 2004 Dynamic Systems, Inc. Page 1 Topics  Introduction  Where used  Structure  What is neeeded  Short comings  How can we use it

Another PillowTalk Presentation  2004 Dynamic Systems, Inc. Introduction

 2004 Dynamic Systems, Inc. Page 3 Introduction  It’s really eXtensible Markup Language  A set of standards defining a toolkit for describing data  HTML describes how information is displayed  Both use tags  XML tags tend to be user defined, must be balanced and is highly structured  Need a Schema or DTD

Another PillowTalk Presentation  2004 Dynamic Systems, Inc. Where Used

 2004 Dynamic Systems, Inc. Page 5 Where Used?  US Government  IRS  DOD  SEC  Compliment/replacement for EDI  Healthcare, banks, retail, wholesale  RPC  SOAP  Web services  SOA  Represent multivalue data in a relational database

 2004 Dynamic Systems, Inc. Page 6 For Example  XBRL  eXtensible Business Reporting Language  Standard tags for financial reporting  Period, Current Assets, Balance Sheet, etc.  download Klipfolio  Uses XML to define properties  FusionWare XML Server  Uses XML to combine data from dissimilar data sources into one web presentation  Oracle, DB2, SQL Server have XML data types

Another PillowTalk Presentation  2004 Dynamic Systems, Inc. Structure

 2004 Dynamic Systems, Inc. Page 8 Structure  Text document containing balanced, nested tags starting with an XML declaration  Tags denote fields and are self describing  Tags can have attributes

 2004 Dynamic Systems, Inc. Page 9 Processing Tag Structure  Special tag containing Processing instructions. Begins with <? Ends with ?>

 2004 Dynamic Systems, Inc. Page 10 Data Tag Structure  data Opening tag Element Closing tag

 2004 Dynamic Systems, Inc. Page 11 Data Tag Structure   data1  data2  Attribute

 2004 Dynamic Systems, Inc. Page 12 XML Declaration Tag   This identifies the document as XML conforming to version 1.0 specification  Using character encoding for Latin-1

 2004 Dynamic Systems, Inc. Page 13 XML Data Lee Burstein Multivalue Data Comment

 2004 Dynamic Systems, Inc. Page 14 Namespaces  Namespaces can be defined to prevent tag naming conflicts  A tag associated with a namespace helps guarantee its uniqueness

 2004 Dynamic Systems, Inc. Page 15 Namespaces Lee Sam

Another PillowTalk Presentation  2004 Dynamic Systems, Inc. What Is Needed

 2004 Dynamic Systems, Inc. Page 17 What is needed?  XML describes data only  No display information  What is displayed  How is it displayed  No validation

 2004 Dynamic Systems, Inc. Page 18 DTD  Document Type Definition  This is the old way of describing and validating XML  Cannot support data types or complex relationships  The DTD is referenced in the XML document   An error is generated if your XML does not conform to your DTD

 2004 Dynamic Systems, Inc. Page 19 XML Schema  W3C recommendation  DTD alternative written in XML  Validates XML  Supports data types  Can define data patterns, ranges, defaults  More powerful, understandable and flexible that DTDs  Stored in an XSD file

 2004 Dynamic Systems, Inc. Page 20 XSD Schema

 2004 Dynamic Systems, Inc. Page 21 XSL  eXtensible Stylesheet Language  Stylesheet language (like CSS) for XML  You will use a combination of Xpath, XSLT and XSL-FO to  Select the part of the XML document to display  Transform it  Format it

 2004 Dynamic Systems, Inc. Page 22 Xpath  Query language for extracting elements from an XML document  Result is dependant upon where you are in the XML document  The same syntax could return different results

 2004 Dynamic Systems, Inc. Page 23 XSLT  eXtensible Stylesheet Language for Transformation  Select the value of one node  Select the values of all nodes of the same name  Conditionally select value  Sort results

 2004 Dynamic Systems, Inc. Page 24 XSL-FO  XSL Formatting Objects  Defines page layout, regions of a page  Output can be a variety of formats  PDF  RTF  TXT  PostScript

Another PillowTalk Presentation  2004 Dynamic Systems, Inc. Short Comings

 2004 Dynamic Systems, Inc. Page 26 Short comings  Remember, this is a standard that continues to evolve  Requires bandwidth  Heavyweight protocol  There is a lot to put together

Another PillowTalk Presentation  2004 Dynamic Systems, Inc. How Can We Use It

 2004 Dynamic Systems, Inc. Page 28 How can we use it?  Quite easy to write a program to export data in a proper XML structure  Most, if not all, databases have tools to read and write XML data using a XSL or DTD  Relational data bases now have XML data type  SOAP  Web Services  SOA

 2004 Dynamic Systems, Inc. Page 29 SOAP  Simple Object Access Protocol  XML based  Can be used for  Messaging systems  RPC  Distributed processing  Structure is quite specific  Cannot use DTD’s

 2004 Dynamic Systems, Inc. Page 30 Web Services  Uses SOAP, XML (Web Service Description Language), HTTP  An object’s methods are publicly exposed  You can use them in your applications  You can expose portions of you application to the world

 2004 Dynamic Systems, Inc. Page 31 SOA  Service Oriented Architecture  Collection of services that communicate with each other  Services are loosely coupled  From different applications  On different servers  Using different databases  Using XML and Web Services to communicate

 2004 Dynamic Systems, Inc. Page 32 Can I Do This?  Sure!  All multivalue applications can be accessed via.net  All multivalue applications can be accessed via java  All multivalue applications can be accessed via XML  You may need to separate screen I/O from business logic

 2004 Dynamic Systems, Inc. Page 33 Why Would I Want To?  You control what discrete portions of your application are available via SOA  Improve customer and vendor communication and access to information  Horizontal parts of your application can be generally available increasing your exposure  Provide On-Demand access to your application

 2004 Dynamic Systems, Inc. Page 34 Resources   msdn.microsoft.com/xml       

 2004 Dynamic Systems, Inc. Page 35