map functions

The table below lists all the "map" built-in functions (in this namespace: http://marklogic.com/xdmp/map).

The map built-in functions are used to create maps. Maps store name-value pairs in an in-memory data structure. You can also persist a map to disk by storing it in a document. Some programming languages implement maps using hash tables, but these map functions make it convenient for you to create and update your own maps.

Maps are represented using the map:map XQuery primitive type. When you serialize an object of map:map type, it serializes to an XML node in the http://marklogic.com/xdmp/map namespace.

8 functions

Function name	Description
map:clear	Clear a map.
map:contains	Returns true if the key exists in the map.
map:count	Returns the number of keys used in the map.
map:delete	Delete a value from a map.
map:get	Get a value from a map.
map:keys	Get the keys used in the map.
map:map	Creates a map.
map:put	Put a value into a map at the given key.