CoreDataModel.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<model>
    <entity name="Article" representedClassName="Article" parentEntity="Publication" syncable="YES" codeGenerationType="class">
        <attribute name="text" optional="YES" attributeType="String"/>
    </entity>
    <entity name="Author" representedClassName="Author" syncable="YES" codeGenerationType="class">
        <attribute name="fullName" optional="YES" attributeType="String"/>
        <relationship name="publications" optional="YES" toMany="YES" deletionRule="Cascade" destinationEntity="Publication" inverseName="author" inverseEntity="Publication"/>
    </entity>
    <entity name="Publication" representedClassName="Publication" isAbstract="YES" syncable="YES" codeGenerationType="class">
        <attribute name="numberOfViews" optional="YES" attributeType="Integer 64" defaultValueString="0" usesScalarValueType="YES"/>
        <attribute name="publishDate" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
        <relationship name="author" optional="YES" maxCount="1" deletionRule="No Action" destinationEntity="Author" inverseName="publications" inverseEntity="Author"/>
    </entity>
</model>