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Understand the difference between '''Sequence''' and '''Relations'''. For example:
 
Understand the difference between '''Sequence''' and '''Relations'''. For example:
   −
:<syntaxhighlight>
+
:<syntaxhighlight lang='text'>
 
Sequence: Entity1 < Entity2 < Entity3
 
Sequence: Entity1 < Entity2 < Entity3
 
Relations: Entity1 < Entity2, Entity2 < Entity3
 
Relations: Entity1 < Entity2, Entity2 < Entity3
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If Entity2 does not exist (or has no changes), then we are left with this:
 
If Entity2 does not exist (or has no changes), then we are left with this:
   −
:<syntaxhighlight>
+
:<syntaxhighlight lang='text'>
 
Sequence: Entity1 < Entity3
 
Sequence: Entity1 < Entity3
 
Relations: - (nothing)
 
Relations: - (nothing)
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Another important difference between above rules is that '''Sequence''' can't express multi-child relations, e.g.
 
Another important difference between above rules is that '''Sequence''' can't express multi-child relations, e.g.
:<syntaxhighlight>
+
:<syntaxhighlight lang='text'>
 
Relations: Entity1 < Entity3, Entity2 < Entity3
 
Relations: Entity1 < Entity3, Entity2 < Entity3
 
</syntaxhighlight>
 
</syntaxhighlight>

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