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Window fails on local:getWindowTitle in getLinkTarget.xql

Created by: bwbohl

<?xml version="1.0" ?>
  <exception>
    <path>/db/apps/Edirom-Online/data/xql/getLinkTarget.xql</path>
    <message>err:XPTY0004 checking function parameter 1 in call 
    string-join(untyped-value-check[xs:anyAtomicType, 
    (eutil:getLocalizedTitle($doc/descendant::mei:manifestation[1]/child::mei:titleStmt[1],
    untyped-value-check[xs:string, $lang]),
    $doc/descendant::mei:manifestation[1]/descendant::mei:identifier[lower-case(untyped-value-check[xs:string, attribute::{}type]) = &quot;shelfmark&quot;][1]
)], &quot; | &quot;): XPTY0004: The actual cardinality for parameter 1 does not match the cardinality declared in the function's signature: eutil:getLocalizedTitle($node as node(), $lang as xs:string?) xs:string. Expected cardinality: exactly one, got 0. [at line 151, column 21, source: /db/apps/Edirom-Online/data/xql/getLinkTarget.xql]
In function:
	eutil:getLocalizedTitle(node(), xs:string?) [151:21:/db/apps/Edirom-Online/data/xqm/util.xqm]
	local:getWindowTitle(node()+, xs:string) [237:18:/db/apps/Edirom-Online/data/xql/getLinkTarget.xql]</message></exception>