Subject: Re: [xsl] What is the most efficient XPath expression for retrieving the first child element? From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Sun, 12 May 2019 12:11:21 -0000 |
Well, it depends on the implementation, of course. For Saxon, child::*[1], though child::Total_Size[1] will only take a nanosecond or two longer. Avoid child::TotalSize, because this will search all the children (it doesn't know there is only one). Michael Kay Saxonica > On 12 May 2019, at 12:43, Costello, Roger L. costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello XSLT experts! > > I want to retrieve the first child element. The children consist of a <Total_Size> element followed by many <String> elements (perhaps thousands of <String> elements). > > <COFF_String_Table> > <Total_Size>4443</Total_Size> > <String>.eh_frame</String> > <String>.debug_aranges</String> > <String>.debug_info</String> > ... > </COFF_String_Table> > > Question: What is the most efficient XPath for selecting the first child element (the <Total_Size> element)? Assume the context node is the <COFF_String_Table> element. Which of these is the most efficient XPath expression: > > (a) child::*[1] > (b) child::Total_Size > (c) something else (what?) > > /Roger
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