如何使用map参数测试XQuery函数

我想测试一个eXistdbXQuery函数 Map datatype 论点根据 eXist-db test framework guide :

XQuery注释参数需要是文字值,因此仅 允许使用字符串和数字。XQSuite因此应用类型转换 每个参数以及断言中使用的值。

然而,我找不到如何将Map数据类型指定为字符串。下面是我的示例代码:

declare 
    %test:arg("input", "{p1}?id={id}") 
    %test:arg("props", "id") 
    %test:arg("props", "ABC") 
    %test:assertEquals("{p1}?id=ABC")
function properties:substitute($input as xs:string, $props as map (xs:string, xs:string)) as xs:string {
    let $keys := map:keys($props)
    let $tokens := $keys ! concat('\{', ., '\}')
    let $replacements := $keys ! $props(.)
    return functx:replace-multi($input, $tokens, $replacements)
};

测试失败,错误如下:

<testcase name="substitute"  class="properties:substitute">
<error type="java:org.exist.xquery.XPathException"  message="exerr:ERROR XPTY0004: The actual cardinality for parameter 2 does not match the cardinality declared in the function's signature: properties:substitute($input as xs:string, $props as map) xs:string. Expected cardinality: exactly one, got 3. [at line 7, column 5]
In function:
    properties:substitute(xs:string, map) [7:5:/db/apps/ssg/modules/properties.xql]
    test:apply(function, item()*) [327:9:jar:file:/C:/Programs/eXist-db/exist.jar!/org/exist/xquery/lib/xqsuite/xqsuite.xql]
    test:apply(function, element(), item()*) [234:9:jar:file:/C:/Programs/eXist-db/exist.jar!/org/exist/xquery/lib/xqsuite/xqsuite.xql]
    test:call-test(function, element(), element()*) [135:32:jar:file:/C:/Programs/eXist-db/exist.jar!/org/exist/xquery/lib/xqsuite/xqsuite.xql]"/>
</testcase>

有什么办法让它工作吗?