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<xsl: when test="not(descendant::*[SomeAttribute])">
Does this mean to check if a context node does NOT have a descendant with a child element SomeAttribute ?
Yes. Since a node set as boolean is false if the set is empty and true if it is not, the effect is that the test will fail if the context node has a
SomeAttributedescendant at least two levels down the tree (grandchild, great-grandchild, etc.). If the context node hasSomeAttributechildren but not deeper descendants, or has noSomeAttributedescendants at all, then the test will succeed.