Russian doll to Venetian blind xsl transformation - xslt

Question

I have been trying to write an xslt transformation to convert 'Russian doll' style xsd into 'Venetian blind' one.
I have written something but that does not work exactly as I intended.
so I have the following xsd document:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="GX" targetNamespace="GX" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:complexType name="topType">
<xs:sequence>
<xs:element name="REQUESTOR" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="RETURN_CANCELLED_CUSTOMERS" nillable="false" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="EXTERNAL_CUSTOMER_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="ON_BEHALF_OF" type="xs:string" nillable="false" minOccurs="1" maxOccurs="1"/>
<xs:element name="MSISDN_aaa" nillable="false" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="GSP_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN_bbb" nillable="false" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="SSPP_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN_ccc" nillable="false" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="SSPC_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN_ddd" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="IMSI" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:schema>
which I try to transform in to:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="GX" targetNamespace="GX" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:complexType name="topType">
<xs:sequence>
<xs:element name="REQUESTOR" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="RETURN_CANCELLED_CUSTOMERS" type="tns:RETURN_CANCELLED_CUSTOMERSType" nillable="false" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="RETURN_CANCELLED_CUSTOMERSType">
<xs:sequence>
<xs:element name="EXTERNAL_CUSTOMER_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="ON_BEHALF_OF" type="xs:string" nillable="false" minOccurs="1" maxOccurs="1"/>
<xs:element name="MSISDN_aaa" type="tns:MSISDN_aaaType" nillable="false" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MSISDN_aaaType">
<xs:sequence>
<xs:element name="GSP_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN_bbb" type="tns:MSISDN_bbbType" nillable="false" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MSISDN_bbbType">
<xs:sequence>
<xs:element name="SSPP_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN_ccc" type="tns:MSISDN_cccType" nillable="false" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MSISDN_cccType">
<xs:sequence>
<xs:element name="SSPC_ID" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN_ddd" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="IMSI" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
<xs:element name="MSISDN" type="xs:string" nillable="false" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
the XSLT I am writing is very much work in progress and I am struggling ... did anyone did a similar thing and could offer a piece of advice? basically I am stuck.
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:exsl="http://exslt.org/common" exclude-result-prefixes='exsl'>
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/">
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tns="GX" targetNamespace="GX" elementFormDefault="qualified" attributeFormDefault="unqualified">
<!-- processing starts here from the root element -->
<xsl:apply-templates/>
</xs:schema>
</xsl:template>
<xsl:template match="xs:complexType[not(#name)]">
<xs:complexType name="{../#name}Type">
<xs:sequence>
<xsl:apply-templates/>
<xs:element>current:<xsl:value-of select="./#name"/> parent: <xsl:value-of select="../#name"/>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:element>no name = parent: <xsl:value-of select="../#name"/>
</xs:element>
</xsl:template>
<!--find the most nested complex type i.e. there are no more child complext types-->
<xsl:template match="xs:complexType[not(xs:sequence/xs:element/xs:complexType)]">
<xs:complexType name="{../#name}Type">
<xsl:copy-of select="child::node()"/>
<xs:element>current:<xsl:value-of select="./#name"/> parent: <xsl:value-of select="../#name"/>NO MORE NESTING!!!!!!!!!!!!!</xs:element>
</xs:complexType>
</xsl:template>
<xsl:template match="xs:element">
<xsl:copy>
<xsl:apply-templates select="attribute()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="attribute()">
<xsl:copy/>
</xsl:template>
<xsl:template match="xs:element[xs:complexType]">
<xs:element name="{#name}" type="{#name}Type" nillable="{#nillable}" minOccurs="{#minOccurs}" maxOccurs="{#maxOccurs}"/>
<xsl:apply-templates/>
</xsl:template>
</xsl:stylesheet>

Answer 1

You could start off, in your root template, by simply selecting all of you complex types in the xsd
<xsl:apply-templates select="//xs:complexType" />
You would then have a template to match complex types, which don't have a name, so you can simply output them with a name based on their parent element.
<xsl:template match="xs:complexType[not(#name)]">
<xs:complexType name="{../#name}Type">
<xsl:apply-templates/>
</xs:complexType>
</xsl:template>
Finally, you would have a template to match the elements with a complex type, and add a type attribute
<xsl:template match="xs:element[xs:complexType]">
<xs:element type="{#name}Type">
<xsl:apply-templates select="#*" />
</xs:element>
</xsl:template>
Here is the full XSLT
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:exsl="http://exslt.org/common" exclude-result-prefixes='exsl'>
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/">
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tns="GX" targetNamespace="GX" elementFormDefault="qualified" attributeFormDefault="unqualified">
<!-- processing starts here from the root element -->
<xsl:apply-templates select="//xs:complexType" />
</xs:schema>
</xsl:template>
<xsl:template match="xs:complexType[not(#name)]">
<xs:complexType name="{../#name}Type">
<xsl:apply-templates/>
</xs:complexType>
</xsl:template>
<xsl:template match="xs:element[xs:complexType]">
<xs:element type="{#name}Type">
<xsl:apply-templates select="#*" />
</xs:element>
</xsl:template>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
When applied to you XSD XML the following is output
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tns="GX"
targetNamespace="GX"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:complexType name="topType">
<xs:sequence>
<xs:element maxOccurs="1" minOccurs="0" name="REQUESTOR" nillable="false" type="xs:string"/>
<xs:element type="RETURN_CANCELLED_CUSTOMERSType" maxOccurs="1" minOccurs="0" name="RETURN_CANCELLED_CUSTOMERS" nillable="false"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="RETURN_CANCELLED_CUSTOMERSType">
<xs:sequence>
<xs:element maxOccurs="1" minOccurs="0" name="EXTERNAL_CUSTOMER_ID" nillable="false" type="xs:string"/>
<xs:element maxOccurs="1" minOccurs="1" name="ON_BEHALF_OF" nillable="false" type="xs:string"/>
<xs:element type="MSISDN_aaaType" maxOccurs="1" minOccurs="0" name="MSISDN_aaa" nillable="false"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MSISDN_aaaType">
<xs:sequence>
<xs:element maxOccurs="1" minOccurs="0" name="GSP_ID" nillable="false" type="xs:string"/>
<xs:element type="MSISDN_bbbType" maxOccurs="1" minOccurs="0" name="MSISDN_bbb" nillable="false"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MSISDN_bbbType">
<xs:sequence>
<xs:element maxOccurs="1" minOccurs="0" name="SSPP_ID" nillable="false" type="xs:string"/>
<xs:element type="MSISDN_cccType" maxOccurs="1" minOccurs="0" name="MSISDN_ccc" nillable="false"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="MSISDN_cccType">
<xs:sequence>
<xs:element maxOccurs="1" minOccurs="0" name="SSPC_ID" nillable="false" type="xs:string"/>
<xs:element maxOccurs="1" minOccurs="0" name="MSISDN_ddd" nillable="false" type="xs:string"/>
<xs:element maxOccurs="1" minOccurs="0" name="IMSI" nillable="false" type="xs:string"/>
<xs:element maxOccurs="1" minOccurs="0" name="MSISDN" nillable="false" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:schema>