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Re: loop for XML [message #89831 is a reply to message #89829]

Mon, 08 December 2014 18:30

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Monday, December 8, 2014 9:41:33 AM UTC-7, mick.mi...@gmail.com wrote:
> I have a question about XML object functions. I've not used XML object functions since until recently we only had IDL 5.5 so I tried the code from Mike on one of the weather data files we parse. It aborts when it reaches the first missing field so the tag is <urn:Value/>. Weather data is always missing one or more fields so the XML files are full of such tags. I had to write a lot of code to handle all of the possible ways missing data is marked. How do I handle this with object functions?

If you had a DTD file, that could solve some of your issues. The DTD would contain the rules for the proper syntax of the XML.

Another approach would be to use a node iterator and turn off schema checking.

pro untitled_2
p=OBJ_NEW('IDLffXMLDOMDocument')
p->Load,FILENAME=test.xml', Schema_Checking = 0
oTopLevel=p->GetDocumentElement() ;return root IDLffXMLDOMDocument
oIt = p->CreateNodeIterator(oTopLevel)
Node = oIt->NextNode()
Repeat Begin
Case Obj_Class(Node) of
'IDLFFXMLDOMTEXT' : Begin
text = Node->GetData()
if ((text.tobyte())[0] ne 10) then print, tn, ': ', text
End
'IDLFFXMLDOMELEMENT' : Begin
tn = Node->GetTagName()
if ((tn.tobyte())[0] ne 10) then print, 'tag = ', tn
End
Else:
EndCase
Node = oIt->NextNode()
EndRep Until (Node eq !null)
End

Inserting a new "<urn:Value/>" line into the previous example,
<root>
<Key1>
<urn:Value/>
<p1>13</p1>
<tb1>10</tb1>
</Key1>
<KeyMeta>
<ax>21</ax>
<ay>59</ay>
<az>26.7</az>
</KeyMeta>
</root>

Execution of the code now produces:
tag = root
tag = Key1
tag = urn:Value
tag = p1
p1: 13
tag = tb1
tb1: 10
tag = KeyMeta
tag = ax
ax: 21
tag = ay
ay: 59
tag = az
az: 26.7

Jim P.
"I still work for Exelis"

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[Message index]

		loop for XML By: skymaxwell@gmail.com on Sat, 06 December 2014 05:17
		Re: loop for XML By: Michael Galloy on Sat, 06 December 2014 10:57
		Re: loop for XML By: skymaxwell@gmail.com on Sun, 07 December 2014 12:35
		Re: loop for XML By: mick.mitanirc3 on Mon, 08 December 2014 08:41
		Re: loop for XML By: Jim Pendleton on Mon, 08 December 2014 18:30
		Re: loop for XML By: mick.mitanirc3 on Tue, 09 December 2014 08:49

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