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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Venetian Blinds vs Garden of Eden patterns for industry
 Original Message From: "G. Ken Holman" >>My XPath knowledge is very weak, but does that allow for matching 'b' in >>the 'tree' of: >> >>ns1:root/a/b ? > > No, you only asked "b whose qualified parent is in namespace ns1" Ah sorry. Instead of 'parent' I should have used the word 'ancestor'. More precisely what I should have said is that XPath can't express "b whose nearest qualified ancestor is in namespace ns1". Sort of b[qualified-ancestor::ns1]! I will only be too pleased if my statement turns out to be false. Thanks, Pete Cordell Codalogic Ltd Interface XML to C++ the easy way using C++ XML data binding to convert XSD schemas to C++ classes. Visit http://codalogic.com/lmx/ or http://www.xml2cpp.com for more info ----- Original Message ----- From: "G. Ken Holman" <gkholman@CraneSoftwrights.com> To: "XML-Dev Mailing list" <xml-dev@lists.xml.org> Sent: Thursday, October 28, 2010 6:40 PM Subject: Re: Venetian Blinds vs Garden of Eden patterns for industry standards XML Schemas > > At 2010-10-28 18:13 +0100, Pete Cordell wrote: >>Original Message From: "G. Ken Holman" >>>At 2010-10-28 14:32 +0100, Pete Cordell wrote: >>>>Hi David, >>>> >>>>It should be ns1:root/a/b/ns2:root/b as Philip says because in the >>>>scheme I described a and b were unqualified. As such there's no >>>>difference in name between b in ns1 and b in ns2 as there would be if >>>>they were qualified. >>>> >>>>I think Philip is right about the issues. It's down to the limitations >>>>in XPath expressibility. You need to say something like: b whose >>>>qualified parent is in namespace ns1. Sort of >>>>b[qualified-parent-ns()=ns1]! >>> >>>b[parent::ns1:*] >>> >>>... or if you are matching nodes: >>> >>> ns1:*/b >> >>My XPath knowledge is very weak, but does that allow for matching 'b' in >>the 'tree' of: >> >>ns1:root/a/b ? > > No, you only asked "b whose qualified parent is in namespace ns1" > >>I had guessed that ns1:*//b might be better, but I think that expression >>would match both 'b's in the Philip's 'tree' of: >> >>ns1:root/a/b/ns2:root/b >> >>Yours confused, > > I'm confused what you are looking for. > > Given the tree: ns1:root/a/b/ns2:root/b > > ns1:*/b selects nothing > ns1:*//b selects both b's > b[parent::ns1] selects nothing > b[parent::ns2] selects the lowest b only > > What *exactly* do you want to address, and from where will you be > addressing it? In a select="" using an expression (and if so from which > context node)? In a match="" using a pattern (which is a subset of XPath > expressions)? > > I haven't been following the entire thread ... I just bristle when I read > statements like "It's down to the limitations in XPath expressibility" and > writing such is like waving a red cape in front of me. I know XPath is > *incredibly* expressive and in the classroom I try and teach students how > to understand the node tree intimately in order to compose the most > appropriate and least wasteful XPath expressions. The XPath exercise is > most often the favourite exercise of the entire week in the class. > > I've not been following the discussion but that statement of yours jumped > out at me and quickly got my attention. > > I hope this helps. > > . . . . . . . . . . Ken > > -- > Crane Softwrights Ltd. http://www.CraneSoftwrights.com/x/ > G. Ken Holman mailto:gkholman@CraneSoftwrights.com > Male Cancer Awareness Nov'07 http://www.CraneSoftwrights.com/x/bc > Legal business disclaimers: http://www.CraneSoftwrights.com/legal > > > _______________________________________________________________________ > > XML-DEV is a publicly archived, unmoderated list hosted by OASIS > to support XML implementation and development. To minimize > spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@lists.xml.org > subscribe: xml-dev-subscribe@lists.xml.org > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > > 
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