How do functions like fn:root and fn:string-length get access to the "context
item" of the calling xquery code? For example, knowing that where the following
function is called my context item will always have an attribute of "product"
with a comma separated list of products to which the assembly applies, how can
I write my functions like fn:root such that the parameter is optional and the
context item is the default? Example:
declare function is-part-of(
$assembly as xs:string? <--- note optionality (sic) of this parameter
) as xs:boolean {
if ($product)
then fn:contains($assembly/@product, $product)
else fn:contains(./@product, $product) <--- note use of context node "."
};
This results in:
[1.0-ml] XDMP-CONTEXT: (err:XPDY0002) Expression depends on the context where
none is defined
But,
$assembly/@product[fn:string-length() > 10]
compiles and runs just fine. So how is this implemented?
Mark
Mark R. Boyd
Principle Engineer
ICS Department
The Church of Jesus Christ of Latter-Day Saints
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