Ecore importer cannot handle some valid Ecore models properly

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What steps will reproduce the problem?
This is just one of the examples, more careful consideration in test cases is 
needed
1. Generate Ecore model following code in Umple Online
2. Import the model
3. Original attributes are changed into association rule improperly

namespace model;

class Product1{
    Address addr;
}

class Address{
}

class Product2{
    Address[] allAddrs;
}

What is the expected output? What do you see instead?

Expected: Semantically the same as original Umple code
Actual: Errors described above, Inconsistent between Ecore generator and 
importer

See also issue 521

Original issue reported on code.google.com by ckchan.cs on 9 May 2014 at 10:32

• Blocking: #521

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Original comment by ckchan.cs on 9 May 2014 at 10:34

• Now blocking: #521

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Original comment by TimothyCLethbridge on 12 May 2014 at 5:48

• Added labels: Component-SemanticsAndGen, Diffic-Med