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Example 23

Example 23. <Document xmlns="http://www.example.org"> <What taxonomy=" http://www.dmoz.org/Society/Book/Philosophy/ " /> <Payload> <Book xmlns="http://www.book.org"> <Title>The First and Last Freedom</Title> <Author>J. Krishnamurti</Author>

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Example 23

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  1. Example 23

  2. <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/Society/Book/Philosophy/" /> <Payload> <Book xmlns="http://www.book.org"> <Title>The First and Last Freedom</Title> <Author>J. Krishnamurti</Author> <Date>1954</Date> <ISBN>0-06-064831-7</ISBN> <Publisher>Harper &amp; Row</Publisher> </Book> </Payload> </Document> Constraint Between Components • Consider an XML instance document that has two parts: • The "what" part describes - using a standard taxonomy - what's in the • other part. • 2. The "payload" part contains a data component. • EXAMPLE #1 • The "what" part uses the DMOZ taxonomy to provide the hierarchy for a • philosophy book. The "payload" part contains data on a philosophy book.

  3. Constraint Between Components EXAMPLE #2 The "what" part uses the DMOZ taxonomy to provide the hierarchy for the Chinese language. The "payload" part contains data on the Chinese language. <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese> </Payload> </Document>

  4. Constraint Between Components PROBLEM How do you create an NVDL script which will validate that: If the value of the taxonomy attribute is http://www.dmoz.org/Society/Book/Philosophy/ then validate the data component in <StructuredPayload> against:     the Book schema If the value of the taxonomy attribute is http://www.dmoz.org/World/Language/Chinese/ then validate the data component in <StructuredPayload> against:     the Chinese schema Further ... the data components in <StructuredPayload> may be expressed in any schema language (XML Schema, Relax NG, DTD, Schematron). How would you create an NVDL script to do this?

  5. <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese> </Payload> </Document> An NVDL Processor Divides the Instance into Sections <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> </Payload> </Document> N V D L processor <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese>

  6. <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese> </Payload> </Document> … and then Validates each Section Document.xsd Validate <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> </Payload> </Document> N V D L processor <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese> Chinese.xsd

  7. <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese> </Payload> </Document> <Document xmlns="http://www.example.org"> <What taxonomy="http://www.dmoz.org/World/Language/Chinese/" /> <Payload> </Payload> </Document> N V D L processor How do we express the constraint between the taxonomy value and the payload value? <Chinese xmlns="http://www.chinese.org"> <Pronouns> <Spoken>Ta</Spoken> </Pronouns> </Chinese>

  8. Acknowledgement • Thanks to George Cristian Bina for explaining to me how to solve this problem (see the following slides for the solution). Thanks George!

  9. Solution • Validate each section independently • Validate the Document section against Document.xsd • Validate the payload section against it's schema • Validate a Book section against Book.xsd • Validate a Chinese section against Chinese.xsd • Attach the payload section to its parent (Document) section and then use Schematron to validate the relationship between the taxonomy and the payload

  10. NVDL Script <?xml version="1.0" encoding="UTF-8"?> <rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0" startMode="example"> <mode name="example"> <namespace ns="http://www.example.org"> <validate schema="Document.xsd" useMode="content"/> <validate schema="rules.sch"> <mode> <anyNamespace> <attach/> </anyNamespace> </mode> </validate> </namespace> </mode> <mode name="content"> <namespace ns="http://www.book.org"> <validate schema="book.xsd"/> </namespace> <namespace ns="http://www.chinese.org"> <validate schema="chinese.xsd"/> </namespace> </mode> </rules> See following slides for an explanation 

  11. <?xml version="1.0" encoding="UTF-8"?> <rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0" startMode="example"> <mode name="example"> <namespace ns="http://www.example.org"> <validate schema="Document.xsd" useMode="content"/> <validate schema="rules.sch"> <mode> <anyNamespace> <attach/> </anyNamespace> </mode> </validate> </namespace> </mode> <mode name="content"> <namespace ns="http://www.book.org"> <validate schema="book.xsd"/> </namespace> <namespace ns="http://www.chinese.org"> <validate schema="chinese.xsd"/> </namespace> </mode> </rules> Validate the Document section against Document.xsd and then for the child (payload) section switch to the content mode.

  12. <?xml version="1.0" encoding="UTF-8"?> <rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0" startMode="example"> <mode name="example"> <namespace ns="http://www.example.org"> <validate schema="Document.xsd" useMode="content"/> <validate schema="rules.sch"> <mode> <anyNamespace> <attach/> </anyNamespace> </mode> </validate> </namespace> </mode> <mode name="content"> <namespace ns="http://www.book.org"> <validate schema="book.xsd"/> </namespace> <namespace ns="http://www.chinese.org"> <validate schema="chinese.xsd"/> </namespace> </mode> </rules> Validate a www.book.org payload against book.xsd and a www.chinese.org payload against chinese.xsd

  13. <?xml version="1.0" encoding="UTF-8"?> <rules xmlns="http://purl.oclc.org/dsdl/nvdl/ns/structure/1.0" startMode="example"> <mode name="example"> <namespace ns="http://www.example.org"> <validate schema="Document.xsd" useMode="content"/> <validate schema="rules.sch"> <mode> <anyNamespace> <attach/> </anyNamespace> </mode> </validate> </namespace> </mode> <mode name="content"> <namespace ns="http://www.book.org"> <validate schema="book.xsd"/> </namespace> <namespace ns="http://www.chinese.org"> <validate schema="chinese.xsd"/> </namespace> </mode> </rules> Attach any child sections of www.example.org to its parent, and then use a Schematron schema to validate constraints between the sections.

  14. Schematron expresses the constraint between the taxonomy value and the payload <?xml version="1.0" encoding="UTF-8"?> <schema xmlns="http://www.ascc.net/xml/schematron"> <ns uri="http://www.example.org" prefix="ex"/> <ns uri="http://www.chinese.org" prefix="ch"/> <ns uri="http://www.book.org" prefix="bk"/> <pattern name="checkTaxonomyPayloadMatch"> <rule context="ex:Document[ex:What/@taxonomy='http://www.dmoz.org/World/Language/Chinese/']"> <assert test="ex:Payload/*[namespace-uri()='http://www.chinese.org']"> When taxonomy is http://www.dmoz.org/World/Language/Chinese/ the Payload should contain content from the http://www.chinese.org namespace </assert> </rule> <rule context="ex:Document[ex:What/@taxonomy='http://www.dmoz.org/Society/Book/Philosophy/']"> <assert test="ex:Payload/*[namespace-uri()='http://www.book.org']"> When taxonomy is http://www.dmoz.org/Society/Book/Philosophy/ the Payload should contain content from the http://www.book.org namespace </assert> </rule> </pattern> </schema>

  15. Implementation • See the folder example23 for the NVDL script, the schemas, and actual XML instances.

  16. Validating Constraints Across Components • This example has shown how to express constraints across components • Furthermore, the components can be expressed in different schema languages. Relax NG Wow! DTD Schematron XML Schema

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