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Checking attributes in an XML file

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Shaggy
Support Moderator

Ireland
6780 Posts

Posted - 11 April 2008 : 11:20:09

I'm building a form at the moment for people to submit link to RSS feeds and I need to verify that all feeds submitted

01. exist, and,
02. follow the specifications found here.

My "pseudo-code" at the moment looks like this:

If the file exists then
 If the file contains and <rdf> tag then
  If that tag has an "xmlns" attribute then
   If that attribute has a value of "http://purl.org/rss/1.0/" then
    File is valid
   else
    File is invalid (wrong namespace)
   end if
  else
   File is invalid (no namespace)
 else
  File is invalid (no <rdf> tag)
else
 File is invalid (doesn't exist)
end if

Not being overly familiar with XML, though, I'm not sure of the best way to translate all of that into VBScript so any pointers would be appreciated.

Search is your friend
“I was having a mildly paranoid day, mostly due to the
fact that the mad priest lady from over the river had
taken to nailing weasels to my front door again.”

Edited by - Shaggy on 11 April 2008 11:21:57

HuwR
Forum Admin

United Kingdom
20579 Posts

Posted - 11 April 2008 : 12:35:04

you don't need to be familiar with any xml to do that, just reading lines from a file

just check if the file exists then read it in a line at a time looking for the tag /string you want

Shaggy
Support Moderator

Ireland
6780 Posts

Posted - 11 April 2008 : 12:56:39

Fair enough

Thought there might have been some funky slick way of doing it with one of the XML objects

Search is your friend
“I was having a mildly paranoid day, mostly due to the
fact that the mad priest lady from over the river had
taken to nailing weasels to my front door again.”

HuwR
Forum Admin

United Kingdom
20579 Posts

Posted - 11 April 2008 : 14:33:19

you can, but it isn't really any more efficient or intuitive, since all you can do is step through it node by node, you could do something along the lines of below, but would need to see a sample of the xml structure to give you the exact string required

Set xmlobj = Server.CreateObject("Microsoft.XMLDOM")
xmlobj.async = false
xmlobj.load (Server.MapPath("your_xml_file.xml"))
Set objNode = xmlobj.SelectSingleNode("rdf/xlmns[field/field_value='http://purl.org/rss/1.0/']")

Shaggy
Support Moderator

Ireland
6780 Posts

Posted - 14 April 2008 : 05:12:39

Thanks, Huw

This is what I came up with in the end:

function validrss(u,n)
	dim objRss,strRss
	validrss=true
	if len(u)=0 or isnull(u) then
		validrss=n
		exit function
	end if
	if validlink(u,true) then
		set objRss=server.createobject("Msxml2.ServerXMLHTTP.3.0")
		objRss.open "GET",u,false
		objRss.send
		if objRss.status<>200 then
			validrss=false
		else
			strRss=objRss.responsexml.xml
			if instr(strRss,"<rdf:RDF")=0 or instr(strRss,"xmlns=""http://purl.org/rss/1.0/""")=0 then validrss=false
		end if
		set objRss=nothing
	else
		validrss=false
	end if
end function

Search is your friend
“I was having a mildly paranoid day, mostly due to the
fact that the mad priest lady from over the river had
taken to nailing weasels to my front door again.”

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