[erlang-questions] Problem with XML validation using xmerl_xsd:validate().

Lian Cheng <>
Mon Dec 29 14:56:27 CET 2008


Hi,

Your schema suggests that the "status" element should have a text value 
among "Valid", "Invalid" and "", while in your XML snippet, the "status" 
element has no text value, rather than have a text value of an empty 
string. I think that the difference between <status></status> and 
<status/> just like, in the C language, the difference between:

     char* p = NULL;

and

     char* p = "";

In a word, <status></status> is not equivalent to <status/> in your 
situation, although I'm not quite sure about my opinion :-)

Cheers
Cheng

Андрей Сединин 写道:
> Hello
> 
> Please help to sort it out:
> 
> trying to validate XML using:
> 
>      {ok, State } = xmerl_xsd:process_schema("test.xsd"),
>      {Entity ,_} = xmerl_scan:file("test.xml"),
>      xmerl_xsd:validate(Entity, State).
> 
> 
> XSD content:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> 
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> 	elementFormDefault="qualified" attributeFormDefault="unqualified">
> 	
> 	<xs:element name="status">
> 		<xs:complexType>
> 			<xs:simpleContent>
> 				<xs:extension base="status-type"/>
> 			</xs:simpleContent>
> 		</xs:complexType>
> 	</xs:element>
> 	<xs:simpleType name="status-type">
> 		<xs:restriction base="xs:string">
> 			<xs:enumeration value="Valid" />
> 			<xs:enumeration value="Invalid" />
> 			<xs:enumeration value="" />
> 		</xs:restriction>
> 	</xs:simpleType>
> </xs:schema>
> and receive next error:
> 
> XML content:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <status/>
> 
> 
> Got an error:
> 
> {error,[{[],xmerl_xsd,
>           {empty_content_not_allowed,[{enumeration,"Valid"},
>                                       {enumeration,"Invalid"},
>                                       {enumeration,[]}]}}]}
> 
> 
> I think it is valid markup for this schema. The same opinion has some  
> other validating parsers.
> 
> How do you think?
> 
> --
> Sedinin
> 
> 
> 




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