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Re: How to mix switches and crossings en connections ? [message #1364 is a reply to message #1361] Fri, 17 June 2016 10:04 Go to previous messageGo to previous message
prenaud is currently offline  prenaud
Messages: 3
Registered: June 2016
Junior Member
Hello Christian,

I have checked the definition of the <xs:choice> element on different reference sites.

On the web site of W3C https://www.w3.org/TR/xmlschema11-1/ chapter 3.8.1 the definition is:

Quote:

(sequence) correspond, in order, to the specified {particles};
(choice) correspond to exactly one of the specified {particles};
(all) correspond to the specified {particles}. The elements can occur in any order.


On Microsoft MSDN https://msdn.microsoft.com/en-us/library/ms256109%28v=vs.110 %29.aspx the definition is:

Quote:
Allows one and only one of the elements contained in the selected group to be present within the containing element.


On the site W3Schools.com http://www.w3schools.com/xml/el_choice.asp :

Quote:
XML Schema choice element allows only one of the elements contained in the <choice> declaration to be present within the containing element.


These three definitions are coherent and indicate that a <xs:choice> element cannot contains both the sub-elements it defines.

In other words, in the RailML, a <connections> element cannot contains both <switch> AND <crossing> elements.

Your code snippet is not valid with the validation tool xmllint which is based on the library LibXML 2.7.7

Best regards,

Patrick

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