Transforming XML Schema to Conceptual XML

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Transforming XML Schema to Conceptual XML

• Reema Al-Kamha
• Spring Research Conference

Supported by NSF
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Motivation

• XML is becoming standard for data representation.
• XML Schema defines the structure of XML
  documents.
• XML Schema has a textual representation.
• There is a need to conceptualize XML Schema.

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XML Schema Components

• The element element
• The attribute element
• The simpleType element
• The complexType element
• The attributeGroup element
• The choice, and sequence elements

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Choice Translation

ltxselement name"Phone"gt
ltxscomplexTypegt
ltxschoice minOccurs"1" maxOccurs"1"gt
ltxselement
name"HomePhone" type"xsstring" minOccurs"1"
maxOccurs"1"/gt
ltxselement name"CellPhone" type"xsstring"/gt
lt/xschoicegt
lt/xscomplexTypegt
lt/xselementgt
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Sequence Translation
ltxselement name "Document gt
ltxscomplexTypegt ltxssequence
minOccurs"1" maxOccurs "100"gt
ltxselement ref"Employee" /gt
lt/xssequencegt
lt/xscomplexTypegt ....................
lt/xselementgt ltxselement name"Employee"gt
ltxscomplexTypegt
ltxssequencegt ltxselement
name"Name" type"NameType"/gt
ltxselement name"Phone"/gt
lt/xssequencegt .

lt/xscomplexTypegt lt/xselementgt
..

. ltxscomplexType
name"NameType"gt ltxssequencegt
ltxselement
name"FirstName" type"xsstring" minOccurs"1"
maxOccurs"1"/gt
ltxselement name"MiddleName" type"xsstring"
minOccurs"0" maxOccurs"2"/gt
ltxselement name"LastName"
type"xsstring" minOccurs"1" maxOccurs"1"/gt
lt/xssequencegt
lt/xscomplexTypegt lt/xselementgt
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Attribute AttributeGroup Translation
ltxselement name"Employee"gt
ltxscomplexTypegt ltxssequencegt
...................
lt/xssequencegt ltxsattribute
name"EmployeeNumber" type "xsstring"
use"required" /gt ltxsattributeGroup
ref"EmployeeAttribute" /gt
lt/xscomplexTypegt lt/xselementgt


ltxsattributeGroup name"EmployeeAttribute" gt
ltxsattribute ref"Status" use"optional" /gt
ltxsattribute name"Language"
type"LanguageType" /gt lt/xsattributeGroupgt
ltxsattribute name"Status"
type"xsstring" /gt ltxssimpleType
name"LanguageType" gt ltxsrestriction
base"xsstring" gt ltxsenumeration
value"English" /gt ltxsenumeration
value"Latin" /gt lt/xsrestrictiongt
lt/xssimpleTypegt
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Key Constraint Translation
ltxselement name "Document"gt
ltxscomplexTypegt
lt/xscomplexTypegt
ltxskey name "AKey"gt ltxsselector
xpath ".//Employee" /gt ltxsfield
xpath "_at_EmployeeNumber"/gt lt/xskeygt
lt/xselementgt
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SubstitutionGroup Translation
ltxselement name"FullTimeEmployee"
substitutionGroup"Employee"/gt
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Translation Result
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Contribution

• A vision for conceptualize XML Schema
• Implement the transformation from XML Schema to
  C-XML