Transforming Global NDR Schemas to Local NDR Schemas

I've been looking a little (unofficially) at how

feasible it might be to transform UBL-NDR-type

(global) schemas into local NDR-type

schemas using XSLT (2.0)

An hour or so of work produced the attached

illustrative prototypes, summarized below.

Note - the concept may be far *less simple* for

the minor version schemas - here I've only

been looking at major version schemas without

the polymorphism envisioned for the global NDR

Note too: I've only tried writing a stylesheet for

the document schemas, I've started with a

module design which is similar for both sets of

schemas and I've kept the schemas very simple,

ignoring annotation/documentation.

I get the impression though that the whole idea

is rather feasible, given adequate resources/time.

Transforming Global NDR Schemas to Local NDR Schemas
(major versions)

Stephen Green
June 2005

Exclusions from this concept illustration:

Transformations for the imported schemas
Transformations of Annotation/Documentation in Schemas
Transformations of Comments in Schemas
** Minor version schemas **

Example of Global NDR:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns="SomeDocument"
    xmlns:uac2-0="GlobalImportedAggregateSchema"
    xmlns:ubc2-0="GlobalImportedBasicSchema"
    targetNamespace="SomeDocument"
    elementFormDefault="qualified"
    attributeFormDefault="unqualified"
    version="1.0">
<xsd:import namespace="GlobalImportedAggregateSchema" schemaLocation="GlobalImportedAggregateSchema.xsd"/>
<xsd:import namespace="GlobalImportedBasicSchema" schemaLocation="GlobalImportedBasicSchema.xsd"/>
<xsd:element name="SomeDocument" type="SomeDocumentType">
    <xsd:annotation>
      <xsd:documentation>Some documentation</xsd:documentation>
    </xsd:annotation>
</xsd:element>
<xsd:complexType name="SomeDocumentType">
    <xsd:annotation>
      <xsd:documentation>Some documentation</xsd:documentation>
    </xsd:annotation>
    <xsd:sequence>
      <xsd:element ref="Something" minOccurs="0" maxOccurs="1">
        <xsd:annotation>
          <xsd:documentation>Some documentation</xsd:documentation>
        </xsd:annotation>
      </xsd:element>
    </xsd:sequence>
</xsd:complexType>
<xsd:element name="Something" type="uac2-0:SomethingType"/>
</xsd:schema>

<?xml version="1.0" encoding="UTF-8"?>
<SomeDocument xmlns:AIAS="LocalImportedAggregateSchema" xmlns:AIBS="LocalImportedBasicSchema" xmlns="SomeDocument" xmlns:uac2-0="GlobalImportedAggregateSchema" xmlns:ubc2-0="GlobalImportedBasicSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="SomeDocument
GlobalDocumentSchema.xsd">
<Something>
  <uac2-0:SomeReference>
   <ubc2-0:SomeID ID="String">normalizedString</ubc2-0:SomeID>
  </uac2-0:SomeReference>
</Something>
</SomeDocument>

Example of Local NDR:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="SomeDocument" xmlns:AIAS="LocalImportedAggregateSchema" xmlns:AIBS="LocalImportedBasicSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="SomeDocument" elementFormDefault="qualified" attributeFormDefault="unqualified" version="1.0">
<xs:import namespace="LocalImportedAggregateSchema" schemaLocation="LocalImportedAggregateSchema.xsd"/>
<xs:import namespace="LocalImportedBasicSchema" schemaLocation="LocalImportedBasicSchema.xsd"/>
<xs:element name="SomeDocument" type="SomeDocumentType"/>
<xs:complexType name="SomeDocumentType">
  <xs:sequence>
   <xs:element name="Something" type="AIAS:SomethingType" minOccurs="0"/>
  </xs:sequence>
</xs:complexType>
</xs:schema>

<?xml version="1.0" encoding="UTF-8"?>
<SomeDocument xmlns:AIAS="LocalImportedAggregateSchema" xmlns:AIBS="LocalImportedBasicSchema" xmlns="SomeDocument" xmlns:uac2-0="GlobalImportedAggregateSchema" xmlns:ubc2-0="GlobalImportedBasicSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="SomeDocument
LocalDocumentSchema.xsd">
<Something>
  <AIAS:SomeReference>
   <AIBS:SomeID ID="String">normalizedString</AIBS:SomeID>
  </AIAS:SomeReference>
</Something>
</SomeDocument>

Sample Stylesheet (for the transformation of the document schemas):

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fn="http://www.w3.org/2005/02/xpath-functions" xmlns:xdt="http://www.w3.org/2005/02/xpath-datatypes" xmlns:ubc2-0="GlobalImportedBasicSchema" xmlns:uac2-0="GlobalImportedAggregateSchema" xmlns:xsd="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="uac2-0 ubc2-0 xsd fn xdt" >
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
  <xsl:for-each select="xsd:schema">
   <xs:schema xmlns:AIBS="LocalImportedBasicSchema" xmlns:AIAS="LocalImportedAggregateSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="SomeDocument">
    <xsl:attribute name="targetNamespace"><xsl:value-of select="@targetNamespace"/></xsl:attribute>
    <xsl:attribute name="elementFormDefault"><xsl:value-of select="@elementFormDefault"/></xsl:attribute>
    <xsl:attribute name="attributeFormDefault"><xsl:value-of select="@attributeFormDefault"/></xsl:attribute>
    <xsl:attribute name="version"><xsl:value-of select="@version"/></xsl:attribute>
    <xs:import>
     <xsl:attribute name="namespace">LocalImportedAggregateSchema</xsl:attribute>
     <xsl:attribute name="schemaLocation">LocalImportedAggregateSchema.xsd</xsl:attribute>
    </xs:import>
    <xs:import>
     <xsl:attribute name="namespace">LocalImportedBasicSchema</xsl:attribute>
     <xsl:attribute name="schemaLocation">LocalImportedBasicSchema.xsd</xsl:attribute>
    </xs:import>
    <xsl:for-each select="xsd:element[1]">
     <xs:element>
      <xsl:attribute name="name"><xsl:value-of select="@name"/></xsl:attribute>
      <xsl:attribute name="type"><xsl:value-of select="@type"/></xsl:attribute>
     </xs:element>
    </xsl:for-each>
    
    <xsl:for-each select="xsd:complexType">
     <xs:complexType>
      <xsl:attribute name="name"><xsl:value-of select="@name"/></xsl:attribute>
      <xs:sequence>
       <xsl:for-each select="xsd:sequence/xsd:element">
        <xs:element>
         <xsl:attribute name="name"><xsl:value-of select="@ref"/></xsl:attribute>
         <xsl:attribute name="type"><xsl:value-of select="concat('AIAS:', @ref, 'Type')"/></xsl:attribute>
         <xsl:attribute name="minOccurs"><xsl:value-of select="@minOccurs"/></xsl:attribute>
        </xs:element>
       </xsl:for-each>
      </xs:sequence>
     </xs:complexType>
    </xsl:for-each>
   </xs:schema>
  </xsl:for-each>
</xsl:template>
</xsl:stylesheet>

Global NDR Imported Aggregate Schema -

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="GlobalImportedAggregateSchema" xmlns:ubc2-0="GlobalImportedBasicSchema" targetNamespace="GlobalImportedAggregateSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="test">
<xsd:import namespace="GlobalImportedBasicSchema" schemaLocation="GlobalImportedBasicSchema.xsd"/>
<xsd:element name="Something" type="SomethingType"/>
<xsd:element name="SomeReference" type="SomeReferenceType"/>
<xsd:complexType name="SomethingType">
  <xsd:sequence>
   <xsd:element ref="SomeReference" minOccurs="0"/>
  </xsd:sequence>
</xsd:complexType>
<xsd:complexType name="SomeReferenceType">
  <xsd:sequence>
   <xsd:element ref="ubc2-0:SomeID" minOccurs="0"/>
  </xsd:sequence>
</xsd:complexType>
</xsd:schema>

Global NDR Imported Basic Schema -

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="GlobalImportedBasicSchema" xmlns:udt="SchemaModule" targetNamespace="GlobalImportedBasicSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="test">
<xsd:import namespace="SchemaModule" schemaLocation="UnqualifiedDataType.xsd"/>
<xsd:element name="SomeID" type="IdentifierType"/>
<xsd:complexType name="IdentifierType">
  <xsd:simpleContent>
   <xsd:extension base="udt:IdentifierType"/>
  </xsd:simpleContent>
</xsd:complexType>
</xsd:schema>

Common Datatypes Schema ('Unqualified') -

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="SchemaModule" xmlns:udt="SchemaModule" xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xsd:complexType name="IdentifierType">
  <xsd:simpleContent>
   <xsd:extension base="xsd:normalizedString">
    <xsd:attribute name="ID" type="xsd:normalizedString" use="optional">
    </xsd:attribute>
   </xsd:extension>
  </xsd:simpleContent>
</xsd:complexType>
</xsd:schema>

Local NDR Imported Aggregate Schema -

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="LocalImportedAggregateSchema" xmlns:AIBS="LocalImportedBasicSchema" targetNamespace="LocalImportedAggregateSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="test">
<xsd:import namespace="LocalImportedBasicSchema" schemaLocation="LocalImportedBasicSchema.xsd"/>
<xsd:complexType name="SomethingType">
  <xsd:sequence>
   <xsd:element name="SomeReference" type="AIBS:SomeReferenceType" minOccurs="0"/>
  </xsd:sequence>
</xsd:complexType>
</xsd:schema>

Local NDR Imported Basic Schema -

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="LocalImportedBasicSchema" xmlns:udt="SchemaModule" targetNamespace="LocalImportedBasicSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="test">
<xsd:import namespace="SchemaModule" schemaLocation="UnqualifiedDataType.xsd"/>
<xsd:complexType name="SomeReferenceType">
  <xsd:sequence>
   <xsd:element name="SomeID" type="udt:IdentifierType"/>
  </xsd:sequence>
</xsd:complexType>
</xsd:schema>

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