Your question is little bit old so I don't know whether you are still looking for an answer but let me give one here anyway.
R2001 A DESCRIPTION MUST only use the WSDL "import" statement to import another WSDL description.
When you import a java class, you specify its fully qualified name (package name and class name). Similarly, when you import a wsdl file in another wsdl file, you have to specify the namespace attribute (like package name) and location. Since the value of the location attribute is just a string, theoretically, you can import any kind of file e.g. "http://example.com/mydoc.doc" Basic profile wants to prevent this and hence rule R2001, which says you can only import wsdl using the import statement. The first code fragment is wrong because it is importing a schema (xsd) as opposed to a wsdl.
Let's look at the second rule:
R2803 In a DESCRIPTION, the namespace attribute of the wsdl:import MUST NOT be a relative URI.
Do you remember how we typically insert images in an HTML page using <img src="images/myImage.gif">. Here "images/myImage.gif is a relative URI, which resolves to your website's absolute URL, something like www.example.com/images/myImage.gif. What rule R2803 is saying is that the namespace attribute in the import statement MUST NOT be a relative URI. It must be the absolute URI. All the code fragments you have posted correctly use namespace attribute so there is no incorrect example for this rule. The incorrect example only applies to R2001.
Let's look at the rest of the rules:
R2002 To import XML Schema Definitions, a DESCRIPTION MUST use the XML Schema "import" statement.
R2003 A DESCRIPTION MUST use the XML Schema "import" statement only within the xsd:schema element of the types section.
R2004 In a DESCRIPTION the schemaLocation attribute of an xsd:import element MUST NOT resolve to any document whose root element is not "schema" from the namespace "http://www.w3.org/2001/XMLSchema".
Look at the wsdl example here: http://coeservice.en.kku.ac.th:8080/TemperatureConvertor/TemperatureConvertorService?WSDL. The example imports a schema. Rule R2002 says if you want to import a schema, use the import tag defined in xsd schema as opposed to the import tag defines in wsdl. The example correctly uses xsd:import. Rule R2003 says the schema import statement must appear in xsd:schema element within wsdl types element. In the example, you can see
which correctly follows rule 2003. Rule 2004 says, whatever you import this way must be an xml schema (it can't be a word doc etc. just like R2001 says you can only import a valid wsdl in another wsdl). How do you know you are importing a valid schema? The root element of the schema document being imported must belong to the namespace "http://www.w3.org/2001/XMLSchema"