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Re: Query reg Recursion

From: Michael Kay <mike@saxonica.com>
Date: Fri, 10 Feb 2012 14:20:03 +0000
Message-ID: <4F352793.8010701@saxonica.com>
To: xmlschema-dev@w3.org
In XSD 1.1 you can write

<xsd:assert test="empty(Ety/Ety/Ety)"/>

if you want to allow two levels of nesting but not three.

There's no equivalent in XSD 1.0.

Michael Kay
Saxonica

On 09/02/2012 07:17, kamal krishna wrote:
> hi team,
>
> I was wondering if you could help me in understanding and designing 
> the recursion in the XSD. My question is regarding defining the max 
> depth of the recursion at the time of definition of the schema. For 
> ex, if I refer to a recursive element, I want to define the number of 
> times the element can be called recursively.
>
> This way I can avoid infinite recursion or creating duplicate objects 
> for calling an object within itself. Please find below the sample 
> schema that I prepared to explain this issue:
>
> /<?xml version="1.0" encoding="UTF-8"?>/
> /<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
> elementFormDefault="qualified"/
> /    attributeFormDefault="unqualified">/
> /
> /
> /<xsd:element name="Ety" type="Entity"/>/
> /<xsd:complexType name="Entity">/
> /<xsd:sequence>/
> /<xsd:element name="A" type="xsd:string" minOccurs="0"/>/
> /<xsd:element name="B" type="xsd:string" minOccurs="0"/>/
> /<xsd:element name="C" type="xsd:string" minOccurs="0"/>/
> /<xsd:element name="EntityAssoc" type="EntityAssoc" minOccurs="0"/>/
> /</xsd:sequence>/
> /</xsd:complexType>/
> /<xsd:complexType name="EntityAssoc">/
> /<xsd:sequence>/
> /<xsd:element name="C" type="xsd:string" minOccurs="0"/>/
> /<xsd:element name="D" type="xsd:string" minOccurs="0"/>/
> /<xsd:element type="Entity" name="Entity" minOccurs="0"/>/
> /</xsd:sequence>/
> /</xsd:complexType>/
> /</xsd:schema>/
>
> I want only one iteration of the EntityAssoc within Entity. Could you 
> please let me know if this is possible?
>
> Thanks a lot for your help,
>
> Regards,
> Krishna Kamal
>
>
Received on Friday, 10 February 2012 14:20:34 GMT

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