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* 1. Database nodes are:** stored in a persistent database on disk;** nodes of a document that has been generated temporarily with {{Code|fn:doc}}, {{Code|fn:parse-xml}} and other functions; or** the result of a [[XQuery Update#Main-Memory Updates|main-memory update]].* 2. Fragments are similar to DOM structures. They are created when XQuery node constructors are used (<code><a/></code>, <code>element a { }</code>, etc.).
→Database Nodes
In BaseX, two internal representations exist for XML nodes:
Fragments require less memory for small XML structures, but database nodes are more efficient for larger amounts of data. Fragments nodes can be converted to database nodes by applying a [[XQuery_Update#Main-Memory Updates|main-memory update]] with an empty body to a node:
