Hi, I'm interested in ordered XPath. How much support of ordered XPath that monetDB has? In MonetDB, I found that the following XPath: /a/b/c/preceding-sibling::*[1] /a/b/c/preceding-sibling::d[1] return the first node according to document order, not according to reverse document order (http://www.w3.org/TR/xpath20/ section 3.2.1.1 and 3.2.2) I tried using bib.xml from XQuery Use Cases (http://www.w3.org/TR/xquery-use-cases/#xmp-data) and compare the result with commercial XML editor. /bib/book/price/preceding-sibling::*[1] - MonetDB returns <title> - supposedly returns <publisher> /bib/book/price/preceding-sibling::author[1] - MonetDB returns Stevens W, Stevens W, and Abiteboul Serge (the first author in document order, similar to /bib/book/author[1]) - supposedly returns Stevens W, Stevens W, and Suciu Dan Regards, Klarinda