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{{Mark|Introduced with Version 9.1:}} ternary if, elvis operator, if without else
{{Mark|Introduced with Version 9.1:}}
{{Mark|Introduced with Version 9.1:}}
{{Mark|Introduced with Version 9.1:}}
→Namespaces
=Expressions=
Some of the extensions that have been added to BaseX may also be made available in other XQuery processors in the near future.
==Regular Expressions==
In analogy with Saxon, you can specify the flag {{Code|j}} to revert to Java’s default regex parser. For example, this allows you to use the word boundary option {{Code|\b}}, which has not been included in the XQuery grammar for regular expressions:
This pragma can be helpful when debugging your code.
In analogy with option declarations and function annotations, [[Transactions#XQuery_Locks|XQuery Locks]] can also set via pragmas:
==XQuery Locks==
In analogy with option declarations and pragmas, [[Transactions#XQuery_Locks|XQuery Locks]] can also set via annotations:
Two non-deterministic functions will be bound to <code>$read</code>, and the result of the function call will be bound to <code>$ignored</code>. As the variable is not referenced in the subsequent code, the let clause would usually be discarded by the compiler. In the given query, however, execution will be enforced because of the BaseX-specific {{Code|non-deterministic}} keyword.
=Namespaces=
In XQuery, some namespaces are statically bound to prefixes. The following query requires no additional namespaces declarations in the query prolog:
<pre class="brush:xquery">
<xml:abc xmlns:prefix='uri' local:fn='x'/>,
fn:exists(1)
</pre>
In BaseX, various other namespaces are predefined. Apart from the namespaces that are listed on the [[Module Library]] page, the following namespaces are statically bound:
{| class="wikitable sortable"
|-
! Description
! Prefix
! Namespace URI
|-
| [[#Annotations|BaseX Annotations]], [[#Pragmas|Pragmas]], …
| <code>basex</code>
| <code><nowiki>http://basex.org</nowiki></code>
|-
| [[RESTXQ#Input Options|RESTXQ: Input Options]]
| <code>input</code>
| <code><nowiki>http://basex.org/modules/input</nowiki></code>
|-
| [[Repository#EXPath_Packaging|EXPath Packages]]
| <code>pkg</code>
| <code><nowiki>http://expath.org/ns/pkg</nowiki></code>
|-
| [[XQuery Errors]]
| <code>err</code>
| <code><nowiki>http://www.w3.org/2005/xqt-errors</nowiki></code>
|-
| [[Serialization]]
| <code>output</code>
| <code><nowiki>http://www.w3.org/2010/xslt-xquery-serialization</nowiki></code>
|}
=Suffixes=
