| • No value has been The content of a computed processing instruction contains "?>".|<code>processing-instruction pi { "?>" }</code>|- valign="top" scope="row"|<code>XQDY0041</code>| The name of a processing instruction is invalid.|<code>processing-instruction { "1" } { "" }</code>|- valign="top" scope="row"|<code>XQDY0043</code>| The node name of an attribute uses certain pre-defined for an external variable, prefixes ornamespaces.|<code>attribute xmlns { "etc" }<br /code>• no context item has been set before the query was executed|- valign="top" scope="row"|<code>XQDY0064</code>| The name of a processing instruction equals "XML" (case insensitive).|<code>processing-instruction xml { "etc" }</code>|- valign="top" scope="row"|<code>XQDY0072</code>| The content of a computed comment contains "--" or ends with "-".|<code>declare variable $x external; $xcomment { "one -- two" }<hr/code>|- valign="top" scope="row"|<code>descendant::*XQDY0074</code>| The name of a computed attribute or element is invalid, or has an unknown prefix.|<code>element { "x y" } { "" }</code>