Cyclic definition in XSD schema produces an error

[meghprkh]

Assume the following example:

<?xml version='1.0' encoding='UTF-8'?>
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'
    xmlns:myns='http://example.com/schemas/myns'
    targetNamespace='http://example.com/schemas/myns'
    elementFormDefault='unqualified'>

    <xs:complexType name='A'>
        <xs:sequence>
            <xs:element name="error" type="AList" />
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name='AList'>
        <xs:sequence>
            <xs:element name="values" type='A' minOccurs='0' maxOccurs='unbounded' />
        </xs:sequence>
    </xs:complexType>

</xs:schema>

Will give src-resolve: Cannot resolve the name 'AList' to a(n) 'type definition' component.xsd(src-resolve)

[angelozerr]

This error is managed with xerces I think, so I fear that we cannot fix it

[meghprkh]

@angelozerr many thanks. I am not familiar with how this library works. Lmk if you want me to file a bug with xerces mailing lists. I probably cannot add any extra information or how to produce that error, so might fall through the triage. If you have the spare time and could file the bug, it would be more informative. Many thanks!

[meghprkh]

The error would not be there if we define the schema using qualified types for the cyclic dependencies

<?xml version='1.0' encoding='UTF-8'?>
<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'
    xmlns:myns='http://example.com/schemas/myns'
    targetNamespace='http://example.com/schemas/myns'
    elementFormDefault='unqualified'>

    <xs:complexType name='A'>
        <xs:sequence>
            <xs:element name="error" type="myns:AList" />
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name='AList'>
        <xs:sequence>
            <xs:element name="values" type='myns:A' minOccurs='0' maxOccurs='unbounded' />
        </xs:sequence>
    </xs:complexType>

</xs:schema>

Note: both error and values need to get qualified, qualifying only one does not work for some reason

[angelozerr]

LemMinx doesn't implement some XML syntax, XML based on XSD validation. It delegate this validation to Xerces and report error (with proper error range since Xerces report error just for a given offset.)

I suggest that you report your issue in Xerces (Java) project.