src-resolve: Cannot resolve the name 'ds:Signature' to an 'element declaration' component

Question

I want to do schema validation using an XSD file. When I import the XSD file to Eclipse, without running the validation class, I have the following error:

src-resolve: Cannot resolve the name 'ds:Signature' to an 'element declaration' component

I am kinda new to XML vs XSD validation process. Although I have looked for similar questions on google, I couldn't figure out what's wrong here.

The XSD file is as follows:

 <?xml version="1.0" encoding="UTF-8"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xerces="http://xerces.apache.org"
        xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
        xmlns:abc="http://abc.123.com" targetNamespace="http://abc.123.com"
        xmlns:xades141="http://uri.etsi.org/01903/v1.4.1#" elementFormDefault="qualified"
        attributeFormDefault="unqualified">
        <xs:import namespace="http://uri.etsi.org/01903/v1.3.2#" schemaLocation="XAdES.xsd"/>
        <xs:import namespace="http://uri.etsi.org/01903/v1.4.1#" schemaLocation="XAdESv141.xsd"/>
        <xs:import namespace="http://www.w3.org/2000/09/xmldsig#" schemaLocation="xmldsig-core-schema.xsd"/>
    <xs:complexType name="headerType">
        <xs:sequence>
            <xs:element name="doorNumber" type="xs:int"/>
            <xs:element ref="ds:Signature"/>
        </xs:sequence>
    </xs:complexType>

How should I modify the XSD to fix this error?

Answer 1

If you have xmldsig-core-schema.xsd in the same directory as your XSD, and if it is the same as this XSD, then you should not be getting an error about a failure to resolve ds:Signature.

Therefore, I suspect that your import is failing, and you're missing or ignoring a warning such as the following:

[Warning] try.xsd:9:56: schema_reference.4: Failed to read schema document 'xmldsig-core-schema.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.

Try this XSD as a test; it loads directly from the URL for xmldsig-core-schema.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
           xmlns:abc="http://abc.123.com"
           targetNamespace="http://abc.123.com"
           elementFormDefault="qualified"
           attributeFormDefault="unqualified">
  <xs:import namespace="http://www.w3.org/2000/09/xmldsig#"
             schemaLocation="http://www.w3.org/TR/2002/REC-xmldsig-core-20020212/xmldsig-core-schema.xsd"/>
  <xs:complexType name="headerType">
    <xs:sequence>
      <xs:element name="doorNumber" type="xs:int"/>
      <xs:element ref="ds:Signature"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

I've tested the above XSD and found that it eliminates the resolution error that you were seeing.