XML parse VBA excel (function trip, & MSXML2.DOMDocument)

Question

I need to parse hundreds of XML files having all the same structure as follows:

Answer 1

It is the special characters (german alphabet) meaning you need to do something like a batch replace on the XML files so opening line is not this:

<?xml version="1.0" encoding="UTF-8"?>

but this:

<?xml version="1.0" encoding="iso-8859-1" ?>

Code to test with after:

Option Explicit
Public Sub test()
    Dim xmlDoc As Object
    Set xmlDoc = CreateObject("MSXML2.DOMDocument") 'New MSXML2.DOMDocument60
    With xmlDoc
        .validateOnParse = True
        .setProperty "SelectionLanguage", "XPath"
        .async = False
        If Not .Load("C:\Users\User\Desktop\Test.xml") Then
            Err.Raise .parseError.ErrorCode, , .parseError.reason
        End If
    End With
    Debug.Print xmlDoc.SelectNodes("//Query").Length
End Sub

---

This is the XML I am using:

<?xml version="1.0" encoding="iso-8859-1" ?>
  <Concepts>
      <ConceptModel name="food">
    <Filters>
      <Filter type="CC"/>
    </Filters>
    <Queries>
      <Query lang="EN">(cheese, bread, wine)</Query>
      <Query lang="DE">(Käse, Brot, Wein)</Query>
      <Query lang="FR">(fromaige, pain, vin)</Query>
   </Queries>
  </ConceptModel>
</Concepts>

Answer 2

As close as possible to your OP

I 'd draw your attention to several errors or misunderstandings:

• [1] Invalid .LoadXML Syntax

What is then the difference between .LoadXML ("C:\folder\folder\name.xml") and .Load ("C:\folder\folder\name.xml") ?

Load expects a file path and then loads the file content into the oXML object.

LoadXML doesn't expect a file parameter, but its actual XML text content that has to be a well formed string.

• [2] XML distinguishes between lower and upper case, therefore nodes need to be addressed by their exact literal names: the <Query> node wouldn't be identified by "query", "ConceptModel" isn't the same as "conceptmodel".

As second issue I would like to ask if Dim oXml As MSXML2.DOMDocument would be the same as Dim oXml As MSXML2.DOMDocument60, since I checked in tools/references "Microsof XML, v6.0"?

No, it isn't. - Please note that the former declaration would load version 3.0 by default. However it's absolutely preferrable to get the version 6.0 (any other versions are obsolete nowadays!)

As you are using so called early binding (referencing "Microsoft XML, v6.0"), I'll do the same but am referring to the current version 6.0:

Dim oXml As MSXML2.DOMDocument60        ' declare the xml doc object
Set oXml = New MSXML2.DOMDocument60     ' set an instance of it to memory

• [3] misunderstanding some XPath expressions

A starting slash "/" in the XPath expression always refers to the DocumentElement (<Concepts> here), you can add .DocumentElement to your document object instead. A starting double slash "//xyz" would find any "xyz" node if existant.

For instance

    oXml.SelectNodes("//Query").Length 

returns the same childNodes number (here: 3) as

    oXml.DocumentElement.SelectNodes("//Query").Length   ' or 
    oXml.SelectSingleNode("//Queries").ChildNodes.Length ' or even       
    oXml.SelectNodes("/*/*/*/Query").Length`.

Code example with reference to XML version 6.0

Of course you'd have to loop over several xml files, the example only uses one (starting in row 2).

Just for the case of not well formed xml files I added a detailled error Routine that enables you to identify the presumed error location. Load and LoadXML both return a boolean value (True if loaded correctly, False if not).

Sub xmlTest()

Dim ws   As Worksheet: Set ws = ThisWorkbook.Sheets(3)
Dim oXml As MSXML2.DOMDocument60
Set oXml = New MSXML2.DOMDocument60
With oXml
    .validateOnParse = True
    .setProperty "SelectionLanguage", "XPath"   ' necessary in version 3.0, possibly redundant here
    .async = False

    If Not .Load(ThisWorkbook.Path & "\xml\" & "name.xml") Then
        Dim xPE        As Object    ' Set xPE = CreateObject("MSXML2.IXMLDOMParseError")
        Dim strErrText As String
        Set xPE = .parseError
        With xPE
           strErrText = "Load error " & .ErrorCode & " xml file " & vbCrLf & _
           Replace(.URL, "file:///", "") & vbCrLf & vbCrLf & _
          xPE.reason & _
          "Source Text: " & .srcText & vbCrLf & vbCrLf & _
          "Line No.:    " & .Line & vbCrLf & _
          "Line Pos.: " & .linepos & vbCrLf & _
          "File Pos.:  " & .filepos & vbCrLf & vbCrLf
        End With
        MsgBox strErrText, vbExclamation
        Set xPE = Nothing
        Exit Sub
    End If

    ' Debug.Print "|" & oXml.XML & "|"

    Dim Queries  As IXMLDOMNodeList, Query As IXMLDOMNode
    Dim Searched As String
    Dim i&, ii&
    i = 2       ' start row
  ' start XPath  
    Searched = "ConceptModel/Queries/Query"                     ' search string
    Set Queries = oXml.DocumentElement.SelectNodes(Searched)    ' XPath
  ' 
    ws.Cells(i, 1) = IIf(Queries.Length = 0, "No items", Queries.Length & " items")
    ii = 1
    For Each Query In Queries
        ii = ii + 1
        ws.Cells(i, ii) = Query.Text
    Next

End With

End Sub

Additional hints

You also might be interested in an example how to list all child nodes via XMLDOM and to obtain attribute names from XML using VBA.

I include a further hint due to later comment (thanks to @barrowc )

"A further issue with using MSXML, v3.0 is that the default selection language is XSLPatterns instead of XPath. Details on some of the differences between MSXML versions are here and the differences between the two selection languages are discussed here."

In the current MSXML2 version 6.0 XPath 1.0 is fully supported. So it seems XSL Patterns have been implemented by Microsoft in earlier days, basically it can be regarded as a simplified subset of XPath expressions before W3C standardisation of XPath.

MSXML2 Version 3.0 allows the integration of XPath 1.0 at least by explicit selection language setting:

oXML.setProperty "SelectionLanguage", "XPath"   ' oXML being the DOMDocument object as used in original post