Simple Xpath Query

Hi,

I want to write some xpath that queries the event document below.

Here is my pseudo code

Give me all the Event/EventData/Data WHERE Event/Provider[@Name = "MYWCF Service" AND WHERE Event/TimeCreated[@SystemTime IS GREATER THAN "2012-03-23"

Here is my document.

<Event>
<System>
  <Provider Name="MyWCF Service" />
  <EventID Qualifiers="0">0</EventID>
  <Level>4</Level>
  <Task>0</Task>
  <Keywords>0x80000000000000</Keywords>
  <TimeCreated SystemTime="2012-03-23T10:43:02.000000000Z" />
  <EventRecordID>260031</EventRecordID>
  <Channel>Application</Channel>
  <Computer>TPR-ITSS-016.btn.opra.gov.uk</Computer>
  <Security />
  </System>
<EventData>
  <Data>2012-03-23 10:43:02,064 [14] DEBUG NHibernate.Engine.CascadingAction [(null)] - cascading to saveOrUpdate: TPR.Brunswick.Models.Milestone</Data>
  </EventData>
  </Event>
LVL 1
MrKevorkianAsked:
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Gertone (Geert Bormans)Information ArchitectCommented:
Event[System/Provider/@Name = "MYWCF Service"][translate(substring-before(System/TimeCreated/@SystemTime, 'T'), '-', '') > 20120323 ]/EventData/Data

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MrKevorkianAuthor Commented:
just trying it out!
MrKevorkianAuthor Commented:
It gives me

Unexpected type - found '20120323' of type xs:integer, expected type xs:string
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Gertone (Geert Bormans)Information ArchitectCommented:
OK, type casting error,
I assumed you were using XPath 1.0
Apparently you are using XPath 2.0
We can be more smart with the dates then

In which context are you using this?
In an XQuery or XSLT2?

And what exactly do you want the test with the date to do?
Does you XML matches your restriction?
So 1 minute past midnight in the morning of 23/2 is considered later than 23/2?
MrKevorkianAuthor Commented:
Hi,

I just evaluated your code using xml spy (latest version) .

In reality I will be running the code using C# 4.0 on Windows Server 2008.

I think XPath 1.0 will probably work.

Let me test it in a console app quickly.
Gertone (Geert Bormans)Information ArchitectCommented:
note that the "=" test for strings is case sensitive
"MyWCF" will not match "MYWCF"
MrKevorkianAuthor Commented:
Hi,

Thanks alot got it working in my console (with a little tweak). This seems to work.

*[System[(Provider/@Name = 'MyWCF Service') and TimeCreated[@SystemTime >= translate("2008-02-21", '-', '')]]]/EventData/Data
MrKevorkianAuthor Commented:
super quick answer!
Gertone (Geert Bormans)Information ArchitectCommented:
welcome,

the construct with the time does not seem right to me in your tweaked version

you are doing the translate on the fixed string, the only difference with the numeric I had is that the result is a string, but putting quotes has the same effect "20080221"
I wonder how dierct SystemTime could work given that XPath1 only knows about strings and numeric
might be that msxml does the right thing
... but hey, if it works, it works :-)
MrKevorkianAuthor Commented:
Thanks, I will have another look at the time comparison as you have suggested.
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