FW: Jing & Trang errors when processing RNC grammar

 
-----Original Message-----
From: Hutchison, Ben 
Sent: Tuesday, 27 April 2004 3:26:pm
To: '[email protected]'
Subject: Jing & Trang errors when processing RNC grammar



Hello, 

I am considering using RelaxNG for describing the structure of XML
configuration files used in a enterprise software system, because its syntax
seems far more intutive than Schemas.

I have developed a grammar by reading the RelaxNG tutorial, but when I
attempt to validate it using Jing (within OxygenXML) I get an brief error
message I cannot understand: E "oneOrMore" contains "group" contains
"attribute" 

When I use the inbuilt Trang tool, I can successfully convert the compact
grammar to XML form, but a conversion on to XML Schema results in a message
like "Choice between attributes and children cannot be presented;
approximating", but no schema object is produced.

There doesn't seem to be any reference or further explanation for parsing
errors. I have spent several hours on this and will have to abandon the use
of RelaxNG unless I can obtain a speedy resolution.

My grammar is shown below, including a leading * indicating the line the
validator fails on. Note that it relates to the only case of recursion in
the grammar- a ConfigGroup can contain nested ConfigGroups within it.  Is
anyone able to offer some explanation as to what these problems mean? Any
general advice on how to "debug" a RelexNG grammar would also be
appreciated.

Regards 
Ben Hutchison 
================================ 
namespace rng = " http://relaxng.org/ns/structure/1.0
<http://relaxng.org/ns/structure/1.0> " 
datatypes xsd = " http://www.w3.org/2001/XMLSchema-datatypes
<http://www.w3.org/2001/XMLSchema-datatypes> " 

start = element ConfigRoot  { ConfigGroup* } 

NamedElementAttributes = 
   attribute name { text }, 
   attribute platform { text }? 

StringValue = element StringValue { xsd:string } 
IntValue = element IntValue { xsd:integer } 
FloatValue = element FloatValue { xsd:float } 
BooleanValue = element BooleanValue { xsd:boolean } 
PrimitiveValue = (StringValue | IntValue | FloatValue | BooleanValue) 

Map = element Map { (MapEntry)* } 
MapEntry = element MapEntry { PrimitiveValue } 
Array = element Array { (PrimitiveValue)* } 

ConfigValue =  ( PrimitiveValue | Map | Array ), NamedElementAttributes 

ConfigGroupEntry = (ConfigGroup |  ConfigValue) 

ConfigGroup =  element ConfigGroup { 
   ConfigGroupEntry*, 
   NamedElementAttributes 
} 


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A leading Australian advertising, information 
and directories business. 

www.yellowpages.com.au
www.whitepages.com.au
www.citysearch.com.au
www.whereis.com.au
www.telstra.com.au

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