Subject: Re: [xsl] Seek an XPath 2.0 expression that handles an empty text field, regardless of how it's represented in XML From: "Sewell, David R. (drs2n) dsewell@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 22 Sep 2016 15:58:59 -0000 |
Hi Folks,
I have a tab-delimited text file. Here is one row of the file:
A B C foo bar
The value in field B is optional. In this particular row there is no value for B so it is empty.
I could represent the text file in XML by creating an element for each field and then putting a wrapper element around the elements. For an empty field I could represent that by omitting the element. So here is one way to represent the row:
<Row> <A>foo</A> <C>bar</C> </Row>
Notice that I omitted the <B> element because the B field is empty.
Alternatively, I could represent an empty field with an empty element:
<Row> <A>foo</A> <B/> <C>bar</C> </Row>
Notice the empty <B> element.
I want an XPath 2.0 expression that outputs "do action" if the B field is empty, regardless of which of the two XML representations is used. This XPath expression seems to work:
if (not(B) or B eq '') then "do action" else "no action"
Is there a better (simpler, more efficient, more future-proof) XPath 2.0 expression?
/Roger
-- David Sewell Manager of Digital Initiatives The University of Virginia Press Email: dsewell@xxxxxxxxxxxx Tel: +1 434 924 9973 Web: http://www.upress.virginia.edu/rotunda
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