Indeed. 
//apps:login

[download]

is short for 

/descendant::apps:login

[download]

Just like with directory paths, expressions starting with "/" start searching at the root. To look for descendants of the topic node, one must use a relative path such as 

descendant::apps:login

[download]
or 
.//apps:login

[download]

In reply to Re^2: Searching subtrees with XML::LibXML::XPathContext always searches whole document - why? by ikegami
in thread Searching subtrees with XML::LibXML::XPathContext always searches whole document - why? by nneul

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