Please excuse a specific and elementary query on XSL.

I understand how

<xsl:template match="block[string-length(./inline)=1]">

matches any <block> element which has as child
an <inline> element whose text content is one character in length.

But how can I change this to match any <block>,
for which the sum of the lengths of its <inline>
child elements is one character; or
alternatively, any <block> the length of whose
whole text content is1 character, since all the
text in my <block> elements is found in child <inline> elements?

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