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Xpath is used for quering information in XML documents.
Can also be used with postgresql databases.
When using xpath, we query an abstact document structure.
This is also represented by a nodetree.
NOTE that `/, /something/else` in the slides are two different queries.
# Nodetree
**Document node** is the root of the tree, thus the whole element.
Will often contain document metadata, and will point at a single root element.
**Element** element represent nodes.
# Location Step
Stuff between two `/`'s.
Looks like `${axis}::${node test}[${predicate_1}][${predicate_2}]`
Axis will default to `child`.
But there are many other, which also have abbreviations.
# Funktioner og Expressions
Man kan køre funktioner såsom concat.
Og de kan bruge queries.
```
concat("hej", /med/dig/text())
```
# Spørgsmål
Vil det her give root element flere gange.
```
//course/..
```
Nope det er sets, den vil ikke være der flere gange.
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