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- simple XPath expressions evaluating to node-sets.

A node matches a pattern if the node is member of the result of evaluating the pattern wrt. some context.
(Compare this with XPointer use of XPath.)

Typical structure:

pattern: location path | ... | location path
location path: /step/ ... // ... /step
step: axis nodetest predicate


matches subsection elements occuring either as child elements of section elements or as descendants of appendix elements.

More precisely:

(The whole XPath language is used for expressions later...)