fix bibl:printIncollectionCitation()#3` to accept multiple biblScopes

[SteffenAstheimer]

This fixes the cardinality errors described in issue #581 and improves the rendering of <biblScope> elements for writings, specifically by accepting multiple of those and sorting them by 'vol', 'jg', 'issue', and 'nr'.

I tested by locally HTTP probing all writings and got zero bad requests. I also manually tested all writings, that use the formerly malfunctioning bibl:printIncollectionCitation()#3 function.

collection('/db/apps/WeGA-data/writings')//tei:biblStruct[
    tei:analytic
    and tei:monogr/tei:title[@level='m']
    and count(.//tei:imprint/tei:biblScope[not(@unit=('pp','col','fol'))]) gt 1
]

Also checked and updated the unit tests meanwhile.

[peterstadler]

Do we need to add a test for one of the failing IDs (A031324, A031792, A031596)?
Or are these cases already covered?

[peterstadler]

You don't need a for loop since the = operator works on sequences, see e.g. https://www.data2type.de/xml-xslt-xslfo/xpath/referenz/operatoren/vergleichsausdruecke

Suggested change

	let $biblScopes := for $unit in ('vol', 'jg', 'issue', 'nr') return $biblStruct/tei:monogr/tei:imprint/tei:biblScope[@unit = $unit]
	let $biblScopes := $biblStruct/tei:monogr/tei:imprint/tei:biblScope[@unit = ('vol', 'jg', 'issue', 'nr')]

[peterstadler]

You can skip the test here since the for loop won't do anything for an empty sequence anyway:

Suggested change

	if(exists($biblScopes)) then for $biblScope in $biblScopes return (<xhtml:span class="{string($biblScope/@unit)}">{bibl:print-single-biblScope-unit(', ', $biblScope, $lang)}</xhtml:span>) else (),
	for $biblScope in $biblScopes return (<xhtml:span class="{string($biblScope/@unit)}">{bibl:print-single-biblScope-unit(', ', $biblScope, $lang)}</xhtml:span>),

[peterstadler]

ok, I see that this file has changed from "inbook" to "book" so there's no collectionTitle anymore.