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You can pass this reader to the Load method of the Xml Document class when it loads and have the reader do the validation for you. I want to do something like the following but I keep getting the error "the Xml Schema Set on the document is either null or has no schemas in it.Provide schema information before calling Validate." What am I doing wrong? The reason I want to avoid the readers is that I want an Xml Document that is not forward-only so I can loop through the doc again after validating it.

Quit End Sub Sub Validate As Xml File Set xml Doc = Create Object("Msxml2. Run ("%windir%\notepad " & s Log Path) End If End Sub Function Process Stand Alone File(s File) Dim basename, str, xdoc Set f = fso. Name ' Load XML input file & validate it Set xdoc = Create Object("Msxml2.

DOMDocument.6.0") xml Property "Prohibit DTD", False xml Property "Resolve Externals", True xml Doc.validate On Parse = True xml Doc.async = False xml Doc.load(str File Name) Select Case xml Doc.parse Error.error Code Case 0 str Result = "Valid: " & str File Name & vb Cr Case Else str Result = vb Cr Lf & "ERROR! proc Files Count = proc Files Count 1 'Release DOM document object Set xml Doc = Nothing End Sub Function Walk Subfolders(Folder) Dim str Folder, current Folder, str Cur Path Set current Folder = fso. Path str Folder = vb Cr Lf & Line Of Equals & _ "Folder: " & str Cur Path & _ vb Cr Lf & Line Of Equals & vb Cr Lf ' Open the log file and append current subfolder. Open Text File(s Log Path, Open File For Appending) f. DOMDocument.6.0") Property "Prohibit DTD", False Property "Resolve Externals", True xdoc.validate On Parse = True xdoc.async = False xdoc.load(fspec) If xdoc.parse Error.error Code = 0 Then str = basename & " is valid" Else If xdoc.parse Error.error Code 0 Then str = basename & " is not valid" & vb Cr Lf & _ xdoc.parse Error.reason & " URL: " & Chr(9) & _ xdoc.parse & vb Cr Lf & "Code: " & Chr(9) & _ xdoc.parse Error.error Code & vb Cr Lf & "Line: " & _ Chr(9) & xdoc.parse & vb Cr Lf & _ "Char: " & Chr(9) & xdoc.parse Error.linepos & vb Cr Lf & _ "Text: " & Chr(9) & xdoc.parse Text End If Process Stand Alone File = str End Function Sub Main 'Initialize files count proc Files Count = 0 ' Get the folder to scan for files.

Both DTD and XSD allow you to define the elements and attributes, an XML document should contain.

XSD has the advantage of being written in XML itself, making it easier to read.

Assuming the top element of the document is allows validation of the document(s) against a given DTD.

Libxml2 exports an API to handle DTDs and validation, check the associated description. So there may be a number of examples on-line, I will just list one for now, others pointers welcome: I suggest looking at the examples found under test/valid/dtd and any of the large number of books available on XML.

This post is a brief but practical demonstration of validating an XML Document against Document Type Definition (DTD) and XML Schema Definition (XSD) files.

Such validation is necessary to ensure that XML sent between both the client, and the server hosting an XML based Web Service, is received as expected.

XSD also allows more information to be defined about an element — such as their data type, namespace and restrictions for values.

There are a few modules for validating XML in Perl 5 but I will be using two from the Lib:: XML namespace.

I will just focus on DTDs for a formats with a fixed simple structure.

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