Using XPath on single node returns elements in all nodes

Question

I am parsing an XML doc that looks something like this:

<MyBook>    <title>Favorite Poems</title>    <issn>123-456</issn>    <pages>45</pages> </MyBook> <MyBook>    <title>Chocolate Desserts</title>    <issn>654-098</issn>    <pages>100</pages> </MyBook> <MyBook>    <title>Jabberwocky</title>    <issn>454-545</issn>    <pages>19</pages> </MyBook> 

I use xpath to pull out the MyBook nodes and iterate through them like so:

xmldoc.xpath("//MyBook").each do |node|    mytitle=node.xpath("//title").text    puts mytitle end 

the output looks like this:

Favorite PoemsChocolateDessertsJabberwocky Favorite PoemsChocolateDessertsJabberwocky Favorite PoemsChocolateDessertsJabberwocky 

as if the node is really the whole xmldoc. However if I print out the node within the iterator, each time it is what I expect, just a single MyBook node. I need to be able to pull out the child nodes from each node successively, not all of the same kind of child node from the whole document. What am I doing wrong?

Answer 1

When you use //title this searches for all <title> elements starting at the root of the document. Use either simply title to find child titles, or .//title if you want to find titles even if they are nested inside of other elements.