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139 bytes added ,  13:13, 2 April 2017
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The options listed on this page influence the way how database [[Commands|commands]] are executed and XQuery expressions are evaluated. Options are divided into [[#Global Options|'''global options''']], which are valid for all BaseX instances, and '''local options''', which are specific to a client or session. Values of options are either ''strings'', ''numbers'' or ''booleans''.
 
The {{Code|.basex}} [[Configuration#Configuration Files|configuration file]] is parsed by every new local BaseX instance. It contains all global options and, optionally, local options at the end of the file.
Various ways exist to access and change options:
* The current value of an option can be requested with the {{Command|GET}} command. Local options can be changed via {{Command|SET}}. All values are ''static'': They stay valid until they are changed once again by another operation. If an option is of type ''boolean'', and if no value is specified, its current value will be inverted.
 
* The {{Code|.basex}} [[Configuration#Configuration Files|configuration file]] is parsed by every new local BaseX instance. It contains all global options. Local options can be specified at the end of the file after the "Location Options" comment:
 
<pre class="brush:perl">
# General Options
DEBUG = false
...
 
# Local Options
CHOP = false
</pre>
* Initial values for global options can also be specified via system properties, which can e.g. be passed on with the [http://docs.oracle.com/javase/1.4.2/docs/tooldocs/windows/java.html#options -D flag] on command line, or using [http://docs.oracle.com/javase/6/docs/api/java/lang/System.html#setProperty(java.lang.String,%20java.lang.String) System.setProperty()] before creating a BaseX instance. The specified keys need to be prefixed with {{Code|org.basex.}}. An example:
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