修改后缀名为zip或者其它,可以查看到xcdatamodel是一个描述文件
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="12141" systemVersion="16G29" minimumToolsVersion="Xcode 7.3" sourceLanguage="Objective-C" userDefinedModelVersionIdentifier="">
<entity name="Doogle" representedClassName="Doogle" syncable="YES">
<attribute name="pexdeg" optional="YES" attributeType="String" syncable="YES"/>
</entity>
<entity name="Entity" syncable="YES"/>
<entity name="GoooGoole" representedClassName="GoooGoole" syncable="YES">
<attribute name="xxx" optional="YES" attributeType="String" syncable="YES"/>
</entity>
<elements>
<element name="Doogle" positionX="18" positionY="72" width="128" height="60"/>
<element name="Entity" positionX="-189" positionY="-162" width="128" height="45"/>
<element name="GoooGoole" positionX="-396" positionY="-405" width="128" height="60"/>
</elements>
</model>