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XML Technologies You Need For Workflow Applications

Explore the XML technologies needed to implement an XML-based workflow application, including XHTML, CSS, XForms, XML Schema, Schematron, Relax NG, DTD, NVDL, and XSLT/XPath.

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XML Technologies You Need For Workflow Applications

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  1. XML Technologies You Need For Workflow Applications Roger L. Costello 2 January, 2009

  2. XML Rob Jill Anthony Sally Pete Workflow Applications • Workflow applications are those applications where documents are moved around a community of people who each perform on it.

  3. XML Technologies • The following slides lays out the XML technologies you will need for implementing an XML-based workflow application • It's a core list, you may need additional XML technologies, depending on your application • This is an all-XML solution. No imperative languages (Java, C#, etc) required.

  4. XHTML + CSS • XHTML is an XML'ized version of HTML • Use CSS to style XHTML documents • XHTML + CSS = your GUI language

  5. XForms • Use XForms to collect user input and automatically generate an XML document composed of the user's input <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> Web Server XML

  6. XML Schema • Use XML Schemas to validate input as it's entered by the user <xs:schema targetNamespace="http://orbeon.org/oxf/examples/dmv"     xmlns:dmv="http://orbeon.org/oxf/examples/dmv"     xmlns:xs="http://www.w3.org/2001/XMLSchema"     elementFormDefault="qualified">      <xs:element name="DMV">        <xs:complexType>            <xs:sequence>                <xs:element name="personal-information">                    <xs:complexType>                        <xs:sequence>                            <xs:element name="name">                                <xs:complexType>                                    <xs:sequence>                                        <xs:element name="first-name" type="dmv:first-name"/>                                        <xs:element name="initial" type="dmv:initial"/>                                        <xs:element name="last-name" type="dmv:last-name"/>                                    </xs:sequence>                                </xs:complexType>                            </xs:element>                            <xs:element name="driver-license-number" type="dmv:driver-license-number"/>                            <xs:element name="birth-date" type="xs:date"/>                        </xs:sequence>                    </xs:complexType>                </xs:element> … </xs:schema validate XML Schema

  7. XML Schema, Schematron, Relax NG, DTD, NVDL • Use one or more XML validation languages server-side <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> XML Schema Relax NG Valid! Web Server Schematron DTD XML

  8. XSLT/XPath • Use XSLT and XPath to process (apply functions to, transform, merge, sort, etc) the XML document <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> XSLT/XPath Web Server XML

  9. XML Database • Many XML documents will be generated over time. Store them in an XML database (native, or XML-enabled) <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> Web Server XML

  10. XQuery • Use XQuery to query the XML documents that are in the XML database <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> <DMV>    <personal-information>        <name>            <first-name>John</first-name>            <initial>A</initial>            <last-name>Smith</last-name>        </name>        <driver-license-number>B987695</driver-license-number>        <birth-date>1983-03-03</birth-date>    </personal-information> … </DMV> XQuery

  11. XProc • Use the XML Pipeline language, XProc, to specify the series of actions (steps) to be applied to the XML document • e.g. validate then process then store in DB then query then … Pipeline

  12. Further Info • See Michael Kay's paper: Building Workflow Applications with XML and XQueryhttp://www.stylusstudio.com/whitepapers/xml_workflow.pdf • Also see Michael Kay's Q&A on Application Processing:http://www.xfront.com/Michael-Kay-on-application-processing/index.html

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