Cart
[Home] [By Thread] [By Date] [Recent Entries]
Hi all,
Here's hoping there's an obvious answer to this. I need to generate minimal XSD schemas from data models that are defined in XML documents. I've got everything working except one little detail. I don't know how to reference the generated schema's target namespace when I'm defining its elements' types. Example: The generated schema defines one complexType named "metadataSet". I want to create an xsd:element with that as its type. In a normal xsd file I would declare a namespace xmlns:tns and then set the element's type to "tns:metadataSet". Here's the gotcha: I can't declare xmlns:tns up in the <xsl:stylesheet> tag because parts of the namespace URI come from my source XML file, which means that they are not available until I start an <xsl:template> tag. Within the template, I construct the namespace URI and store it as an xsl:param, but this doesn't help much. XSL has this nifty setup with declaring namespaces for elements and attributes, but these namespaces get extra little inserts like xmlns:ns0 that only appear during the transform process. This leaves me in the lurch because I need to reference that namespace when I declare the vale of an attribute. As far as I can tell, there is no way for my xsl document to know exactly what that auto-generated namespace prefix will look like in the output document. That would be fine if I only needed to append the prefix to attribute and element names because I could basically ignore the whole thing and let the processor handle it, but I need to put the namespace prefix into the VALUE of a "type" attribute. There's got to be either a way to: 1) programmatically reference the auto-generated namespace prefixes, 2) stop the processor from generating those little inserts in the namespace prefixes, or 3) bypass the whole headache in some way that I didn't notice. ##### # My XSL Document (Currently the metadataSet element's type is set to "tns:metadataSet", but the tns prefix is not declared anywhere. #### <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet version="1.0" xmlns="http://www.w3.org/2001/XMLSchema" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/> <xsl:template match="/"> <xsl:param name="targetNS">http://www.mediashelf.com/xsd/<xsl:value- of select="metadataModel/@owner"/>/<xsl:value-of select="metadataModel/@name"/></xsl:param> <schema targetNamespace="{$targetNS}"> <complexType name="metadataSet"> <sequence> <xsl:for-each select="metadataModel/metadataElement"> <element name="{@name}" type="{valueType}" xmlns="http:// www.w3.org/2001/XMLSchema"/> </xsl:for-each> </sequence> </complexType> <element name="metadataSet" type="tns:metadataSet"/> </schema> </xsl:template> </xsl:stylesheet> ##### # Example of the (ideal) schema that I want to generate: #### <?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.mediashelf.com/xsd/MSHLF/myModel"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:tns="http://www.mediashelf.com/xsd/MSHLF/myModel">
<complexType name="metadataSet">
<sequence>
<element type="xsd:string" name="myTextField"></element>
</sequence>
<attribute name="model" type="xsd:string"></attribute>
</complexType><element name="metadataSet" type="tns:metadataSet"></element> </schema> ##### # Example of the XML Files that get Transformed #### <?xml version="1.0" encoding="ISO-8859-1"?> <?xml-stylesheet type="text/xsl" href="SchemaFromModelDef.xsl"?> <metadataModel name="myModel" owner="MSHLF" xmlns:tns="http://www.mediashelf.com/xsd/ModelDefinitionSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mediashelf.com/xsd/ ModelDefinitionSchema ModelDefinitionSchema.xsd "> <metadataElement name="myTextField" type="tns:textfield"> <label>Text Field Label</label> <description>Text Field Description</description> <valueType>xsd:string</valueType> <defaultValue>Enter something!</defaultValue> <valuesUsedToDate> <stringValue>"first value used"</stringValue> <stringValue>"second value used"</stringValue> </valuesUsedToDate> </metadataElement> </metadataModel> Matt Zumwalt matt.zumwalt@xxxxxxxxxxxxxxxxxx 917-687-8551 Visit http://www.yourmediashelf.com
|
