请解释 CDA EntryRelationship 元素
我可以访问 HL7 临床文档架构 2.0 版，该架构指出它本质上用于将 CDA 文档中的条目相互链接。具体来说，它链接所谓的“源”条目和“目标”条目。我还了解了不同类型的关系（CAUS、COMP、GEVL、MFST、REFR、RSON、SAS、SPRT、SUBJ、XCRPT），并且对这些关系有所了解。
我的主要问题：“源”和“目标”元素是什么？它们是包含 entryRelationship 的元素，还是 entryRelationship 包含的元素？
例如：
<entry typeCode="DRIV">
<act classCode="ACT" moodCode="EVN">
...
<entryRelationship typeCode="SUBJ">
<observation classCode="OBS" moodCode="EVN">
...
<entryRelationship typeCode="REFR">
<observation classCode="OBS" moodCode="EVN">
...
</observation>
</entryRelationship>
</observation>
</entryRelationship>
</act>
</entry>
在上面的代码片段中，根据我的理解，act与第一个observation之间存在SUBJ关系，而两个act之间存在REFR关系<代码>观察。这是正确的吗？
I have access to the HL7 Clinical Document Architecture, Release 2.0, which states that it is used essentially to link entries with each other in a CDA document. Specifically, it links between what is called the "source" and the "target" entries. I also read about the different types of relationships (CAUS, COMP, GEVL, MFST, REFR, RSON, SAS, SPRT, SUBJ, XCRPT) and somewhat understand those.
My main question: what are the "source" and "target" elements? Are they the element containing the entryRelationship, and the element contained by entryRelationship?
For example:
<entry typeCode="DRIV">
<act classCode="ACT" moodCode="EVN">
...
<entryRelationship typeCode="SUBJ">
<observation classCode="OBS" moodCode="EVN">
...
<entryRelationship typeCode="REFR">
<observation classCode="OBS" moodCode="EVN">
...
</observation>
</entryRelationship>
</observation>
</entryRelationship>
</act>
</entry>
In the above snippet, according to my understanding, there is a SUBJ relationship between the act the the first observation, and there is a REFR relationship between the two observations. Is this correct?
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EntryRelationship 的源是在其主体中包含示例中的元素的条目，源条目是
，目标是
它可以使用entryRelationship 元素的“InversionInd”属性来指示逆关系。如果此属性设置为 true，源和目标将反转。
The source of a entryRelationship is the entry that contains in its body the element in your example the source entry is
and the target is
Its is posible to indicate a inverse relationship using the "InversionInd" attribute of the entryRelationship elemet. If this attribute is set to true source and target are inverted.