Subject: [xsl] Seek an XPath 2.0 expression for checking that each object in a file system has one parent From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Sun, 16 Oct 2016 22:32:21 -0000 |
Hi Folks, I am modeling a file system. Below is a sample instance. D1 means Directory 1, F1 means File 1, etc. The instance says this: the content of directory 1 is directory 2 and file 1. The content of directory 2 is file 2. Stated another way, directory 2 and file 1 are contained in directory 1, and file 2 is contained in directory 2. <Root> <D1> <D2/> <F1/> </D1> <D2> <F2/> </D2> </Root> I want an XPath 2.0 expression which returns true if each object has one parent. An "object" is a directory or a file. In the example above each object has one parent, so the XPath should return true. Below is an illegal file system because F1 has two parents: D1 and D2. <Root> <D1> <D2/> <F1/> </D1> <D2> <F2/> <F1/> </D2> </Root> The XPath should return false. This XPath is almost correct: for $i in /Root/* return for $j in $i/* return not(name($j) = $i/following-sibling::*/*/name()) I say it is "almost" correct because it returns multiple Booleans, not a single Boolean result. Two Questions: 1. What is the correct XPath expression? 2. Is there a different way to model in XML a file system that would enable a simple XPath expression? /Roger
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