Parsing XML
in [TCL]
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From: Richard Owlett on 28 Jan 2010 19:53 http://wiki.tcl.tk/11020 provides most of what I'm looking for. I have minimal experience with TCL and just getting my feet wet with XML. The data I'm attempting to parse comes from openstreetmap.org. This exercise is _PRIMARILY_ for learning more of *TCL* and *XML*. After looking at the output of the code at wiki.tcl.tk/11020, It would appear straight forward to extract just the information of interest (node lat/lon, nodes in a way). My question. It appearing so straight forward makes me think there should already be tools to extract related information from an XML file. Is there? Am I on the right track?
From: George Petasis on 28 Jan 2010 20:21 στις 29/1/2010 02:53, O/H Richard Owlett έγραψε: > http://wiki.tcl.tk/11020 provides most of what I'm looking for. > I have minimal experience with TCL and just getting my feet wet with XML. > > The data I'm attempting to parse comes from openstreetmap.org. > This exercise is _PRIMARILY_ for learning more of *TCL* and *XML*. > > After looking at the output of the code at wiki.tcl.tk/11020, It would > appear straight forward to extract just the information of interest > (node lat/lon, nodes in a way). > > My question. It appearing so straight forward makes me think there > should already be tools to extract related information from an XML file. > Is there? Am I on the right track? I think it is better to look ate tdom (http://wiki.tcl.tk/1948) or TclXML... George
From: slebetman on 28 Jan 2010 22:06 On Jan 29, 9:21 am, George Petasis <peta...(a)iit.demokritos.gr> wrote: > ÏÏÎ¹Ï 29/1/2010 02:53, O/H Richard Owlett ÎγÏαÏε: > > >http://wiki.tcl.tk/11020provides most of what I'm looking for. > > I have minimal experience with TCL and just getting my feet wet with XML. > > > The data I'm attempting to parse comes from openstreetmap.org. > > This exercise is _PRIMARILY_ for learning more of *TCL* and *XML*. > > > After looking at the output of the code at wiki.tcl.tk/11020, It would > > appear straight forward to extract just the information of interest > > (node lat/lon, nodes in a way). > > > My question. It appearing so straight forward makes me think there > > should already be tools to extract related information from an XML file.. > > Is there? Am I on the right track? > > I think it is better to look ate tdom (http://wiki.tcl.tk/1948) or TclXML.... > I second tdom because it implements standard DOM methods like getElementById and getElementsByTagName
From: MartinLemburg on 29 Jan 2010 05:08 Hi, I mostly use tdom, because it is for me more intuitive in its usage. If it is about XML style sheets (transformations), than I use tdom, because it is much easier to use. If there is a need for a full XPaths Version 2.0 support, than you would have to use TclXML/TclDOM. If it is about using XML Schemes to validate XML files, than there is no other way, than using TclXML/TclDOM, too. Best regards, Martin Lemburg On 29 Jan., 01:53, Richard Owlett <rowl...(a)pcnetinc.com> wrote: > http://wiki.tcl.tk/11020provides most of what I'm looking for. > I have minimal experience with TCL and just getting my feet wet > with XML. > > The data I'm attempting to parse comes from openstreetmap.org. > This exercise is _PRIMARILY_ for learning more of *TCL* and *XML*. > > After looking at the output of the code at wiki.tcl.tk/11020, It > would appear straight forward to extract just the information of > interest (node lat/lon, nodes in a way). > > My question. It appearing so straight forward makes me think > there should already be tools to extract related information from > an XML file. Is there? Am I on the right track?
From: PaulWalton on 30 Jan 2010 01:55
On Jan 28, 6:53 pm, Richard Owlett <rowl...(a)pcnetinc.com> wrote: > http://wiki.tcl.tk/11020provides most of what I'm looking for. > I have minimal experience with TCL and just getting my feet wet > with XML. > > The data I'm attempting to parse comes from openstreetmap.org. > This exercise is _PRIMARILY_ for learning more of *TCL* and *XML*. > > After looking at the output of the code at wiki.tcl.tk/11020, It > would appear straight forward to extract just the information of > interest (node lat/lon, nodes in a way). > > My question. It appearing so straight forward makes me think > there should already be tools to extract related information from > an XML file. Is there? Am I on the right track? If you don't want to use a catch-all xml parser and you know what to expect in the xml file, then you can write some code to parse out exactly what you want. To me this is simpler and more reliable than using an extension because the data might not be perfectly valid xml or the parser might be imperfect. set token [http::geturl "http://site.org/file.xml"] set data [http::data $token] http::cleanup $token And if $data looks something like this: <lattitude>30°12â²50â³N</lattitude> <longitude>92°01â²46â³W</longitude> <otherstuff>abc123</otherstuff> Then you can do this: set index [string first {<lattitude>}] incr index 11 set end [string first {</lattitude>} $index] incr end -1 set lattitude [string range $data $index $end] You can also use regular expressions... |