I have an XPath query which is doing what I want, namely selecting a union of \'surname\' & \'given-names\' with the given predicates (It\'s actually either/or that I ne
In addition to Alejandro's and Seva's good answers, another alternative is
(/header/authors/surname | /header/authors/given-names)[text() and @id='1']
This is valid in XPath 1.0. It still is a bit redundant, but is more succinct than the long-winded version in your question.
A further alternative would be to declare a variable for surname elements and a variable for given-name elements, and then
($surnames | $given-names)[text() and @id='1']
That would probably be longer in total, but easier to read than the above.
How about
/header/authors/*[(name() = "surname" or name()="given-names") and ./text() and @id='1']
First, this is valid XPath 2.0:
/header/authors/(surname|given-names)[./text() and @id='1']
Second, this XPath 1.0:
/header/authors/*[self::surname|self::given-names][text()][@id='1']