Whats the differences between XPATH and Database?

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1.When i use list widget or data grid,  i can select from xpath or database as datasource. They seems has very similar function,  what’s the exact difference?   2. when use a dropdown filter on list view,   i can also select Xpath or database on filter option item. What’s the difference?    They must match with list view’s datasource type?  
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1 answers
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  1. Database only allows constraints per attribute. Xpath allows you to add more elaborate constraints to the retrieve command, not only per attribute but also over association.
  2. Same difference as 1
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