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The following tables list the error codes that are known to BaseX, a short description, and examples of queries raising that errors. Errors that are specific to BaseX can be found in the descriptions of the respective [[Module Library|modules]].
Original definitions of the error codes are found in the [httphttps://www.w3.org/TR/xquery-30/ XQuery 3.0], [httphttps://www.w3.org/TR/xpath-functions-3031/ XQuery 3.0 Functions], [httphttps://www.w3.org/TR/xquery-update-10/ XQuery 1.0 Update], [httphttps://www.w3.org/TR/xpath-full-text-10/ XQuery 1.0 Full Text], and [http://www.expath.org/spec/http-client EXPath HTTP] Specifications.
=Static Errors=
|<code>XPST0003</code>
|An error occurred while ''parsing'' the query string (i.e., before the query could be compiled and executed). This error is the most common one, and may be accompanied by a variety of different error messages.
|<code>1+<hrbr/>for i in //* return $i</code>
|- valign="top" scope="row"
|<code>XPST0005</code>
|<code>XPST0008</code>
|A variable or type name is used that has not been defined in the current scope.
|<code>$a---<hrbr/>element(*, x)</code>
|- valign="top" scope="row"
|<code>XPST0017</code>
| • The specified function is unknown,<br />• it uses the wrong number of arguments, or, when calling Java functions:<br />• there is more than one function with the same number of arguments.
|<code>unknown()<hrbr/>count(1,2,3)</code>
|- valign="top" scope="row"
|<code>XPST0051</code>
| An unknown QName is used in a ''sequence type'' (e.g. in the target type of the {{Code|cast}} expression).
|<code>1 instance of x<hrbr/>"test" cast as xs:itr</code>
|- valign="top" scope="row"
|<code>XPST0080</code>
|<code>XPST0081</code>
| • A QName uses a prefix that has not been bound to any namespace, or<br />• a pragma or option declaration has not been prefixed.
|<code>unknown:x<hrbr/>(# pragma #) { 1 }</code>
|-
| colspan=3 style="background-color:white;"|
|<code>XPTY0004</code>
| This error is raised if an expression has the wrong type, or cannot be cast into the specified type. It may be raised both statically (during query compilation) or dynamically (at runtime).
|<code>1 + "A"<hrbr/>abs("a")<hrbr/>1 cast as xs:gYear</code>
|- valign="top" scope="row"
|<code>XPTY0018</code>
|<code>XPDY0002</code>
| • No value has been defined for an external variable, or<br />• no context item has been set before the query was executed.
|<code>declare variable $x external; $x<hrbr/>descendant::*</code>
|- valign="top" scope="row"
|<code>XPDY0050</code>
| • The operand type of a {{Code|treat}} expression does not match the type of the argument, or<br/>• the root of the context item must be a document node.
|<code>"string" treat as xs:int<hrbr/>"string"[/]</code>
|-
| colspan=3 style="background-color:white;"|
|<code>FOAR0002</code>
| A numeric declaration or operation causes an over- or underflow.
|<code>12345678901234567890<hrbr/>xs:double("-INF") idiv 1</code>
|-
| colspan=3 style="background-color:white;"|
|<code>FOCA0002</code>
| • A float number cannot be converted to a decimal or integer value, or<br />• a function argument cannot be converted to a valid QName.
|<code>xs:int(xs:double("INF"))<hrbr/>QName("", "el em")</code>
|- valign="top" scope="row"
|<code>FOCA0003</code>
|<code>FORG0001</code>
| A value cannot be cast to the required target type.
|<code>xs:integer("A")<hrbr/>1 + <x>a</x></code>
|- valign="top" scope="row"
|<code>FORG0002</code>
