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This page is part of the [[XQuery|XQuery Portal]].
Serialization parameters define how XQuery items and XML nodes will be ''serialized'' (i.e., returned to the client or an API, usually in textual form). The official parameters are defined in the [httphttps://www.w3.org/TR/xslt-xquery-serialization-31 W3C XQuery Serialization 3.1] document. In BaseX, they can be specified by:
* including them in the [[XQuery_3.0#Serialization|prolog of the XQuery expression]];
|- valign="top"
| {{Code|parameter-document}}
| Parses the value as XML document with additional serialization parameters (see the [httphttps://www.w3.org/TR/xslt-xquery-serialization-31/#serparams-in-xdm-instance Serialization Specification] for more details).
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=Character mappings=
Character maps allow a specific character in the instance of the data model to be replaced with a specified string of characters during serialization. The string that is substituted is output "as is," and the serializer performs no checks that the resulting document is well-formed. This may only occur in documents parsed with {{Code|parameter-document}}. If a character is mapped, then it is not subjected to XML or HTML escaping. For details refer to section [https://www.w3.org/TR/2015/CR-xslt-xquery-serialization-31-20151217/#character-maps 11 Character maps] in the [httphttps://www.w3.org/TR/xslt-xquery-serialization-31 W3C XQuery Serialization 3.1] document
This example maps the Unicode U+00A0 NO-BREAK SPACE as   (without the serialization parameter, the Unicode character would be output):
