Hi,
I am currently struggling to narrow down an issue caused while converting String to XML and then attempting to extract data via XPath:
The idea is that the schema might be at fault and in order to verify the XML in bulk, I was in search for a XML validator node but only found that one:
This only works with a special data input type of “URI Object” but not XML with XML contained within a column. Therefore I’d like to suggest to create a node which helps validating XML.
Best
Mike
Nice suggestion! I suspect you will get more than a few votes for this one 
Maybe not just the XSD schema but also against XML Namespaces like the following example XML of XMP Meta Data?
<?xml version="1.0" encoding="UTF-8"?>
<x:xmpmeta x:xmptk="Adobe XMP Core 4.2-c020 1.124078, Tue Sep 11 2007 23:21:40 "
xmlns:x="adobe:ns:meta/">
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description aux:Firmware="1.1.4" aux:FlashCompensation="0/1" aux:ImageNumber="0" aux:Lens="28-75mm" aux:LensID="161" aux:LensInfo="28/1 75/1 0/0 0/0" aux:LensSerialNumber="0000000000" aux:SerialNumber="033024023928" crs:AlreadyApplied="True" crs:BlueHue="0" crs:BlueSaturation="0" crs:Brightness="0" crs:CameraProfile="Embedded" crs:CameraProfileDigest="D6AF5AEA62557FCE88BC099788BBD3CC" crs:ChromaticAberrationB="0" crs:ChromaticAberrationR="0" crs:Clarity="+46" crs:ColorNoiseReduction="0" crs:Contrast="0" crs:ConvertToGrayscale="False" crs:CropAngle="-0.809209" crs:CropBottom="0.902284" crs:CropConstrainToWarp="0" crs:CropHeight="3002" crs:CropLeft="0.076825" crs:CropRight="0.907381" crs:CropTop="0.096908" crs:CropUnit="0" crs:CropWidth="4502" crs:Defringe="0" crs:Exposure="+0.26" crs:FillLight="49" crs:GrainAmount="0" crs:GreenHue="0" crs:GreenSaturation="0" crs:HasCrop="True" crs:HasSettings="True" crs:HighlightRecovery="67" crs:HueAdjustmentAqua="0" crs:HueAdjustmentBlue="0" crs:HueAdjustmentGreen="0" crs:HueAdjustmentMagenta="0" crs:HueAdjustmentOrange="0" crs:HueAdjustmentPurple="0" crs:HueAdjustmentRed="0" crs:HueAdjustmentYellow="0" crs:IncrementalTemperature="0" crs:IncrementalTint="0" crs:LensManualDistortionAmount="0" crs:LensProfileEnable="0" crs:LensProfileSetup="LensDefaults" crs:LuminanceAdjustmentAqua="0" crs:LuminanceAdjustmentBlue="0" crs:LuminanceAdjustmentGreen="0" crs:LuminanceAdjustmentMagenta="0" crs:LuminanceAdjustmentOrange="0" crs:LuminanceAdjustmentPurple="0" crs:LuminanceAdjustmentRed="0" crs:LuminanceAdjustmentYellow="0" crs:LuminanceSmoothing="0" crs:ParametricDarks="0" crs:ParametricHighlightSplit="75" crs:ParametricHighlights="+32" crs:ParametricLights="0" crs:ParametricMidtoneSplit="50" crs:ParametricShadowSplit="25" crs:ParametricShadows="-12" crs:PerspectiveHorizontal="-1" crs:PerspectiveRotate="0.0" crs:PerspectiveScale="100" crs:PerspectiveVertical="0" crs:PostCropVignetteAmount="-36" crs:PostCropVignetteFeather="50" crs:PostCropVignetteHighlightContrast="46" crs:PostCropVignetteMidpoint="33" crs:PostCropVignetteRoundness="-42" crs:PostCropVignetteStyle="1" crs:ProcessVersion="5.7" crs:RedHue="0" crs:RedSaturation="+8" crs:Saturation="-8" crs:SaturationAdjustmentAqua="0" crs:SaturationAdjustmentBlue="0" crs:SaturationAdjustmentGreen="0" crs:SaturationAdjustmentMagenta="0" crs:SaturationAdjustmentOrange="-1" crs:SaturationAdjustmentPurple="0" crs:SaturationAdjustmentRed="-22" crs:SaturationAdjustmentYellow="+8" crs:ShadowTint="0" crs:Shadows="0" crs:SharpenDetail="25" crs:SharpenEdgeMasking="72" crs:SharpenRadius="+1.0" crs:Sharpness="59" crs:SplitToningBalance="0" crs:SplitToningHighlightHue="0" crs:SplitToningHighlightSaturation="0" crs:SplitToningShadowHue="0" crs:SplitToningShadowSaturation="0" crs:ToneCurveName="Linear" crs:Version="6.2" crs:Vibrance="+10" crs:VignetteAmount="0" crs:WhiteBalance="As Shot" exif:ApertureValue="2970854/1000000" exif:CustomRendered="0" exif:DateTimeDigitized="2015-04-08T09:06:03.00+02:00" exif:DateTimeOriginal="2015-04-08T09:06:03.00+02:00" exif:ExifVersion="0230" exif:ExposureBiasValue="0/1" exif:ExposureMode="1" exif:ExposureProgram="1" exif:ExposureTime="1/160" exif:FNumber="28/10" exif:FocalLength="75/1" exif:FocalPlaneResolutionUnit="2" exif:FocalPlaneXResolution="5472000/1436" exif:FocalPlaneYResolution="3648000/956" exif:MaxApertureValue="3/1" exif:MeteringMode="5" exif:PixelXDimension="3002" exif:PixelYDimension="4502" exif:RecommendedExposureIndex="50" exif:SceneCaptureType="0" exif:SensitivityType="2" exif:ShutterSpeedValue="7321928/1000000" exif:WhiteBalance="0" photoshop:LegacyIPTCDigest="BFD22B532681513B6BB37F089176F7AC" rdf:about="" tiff:ImageLength="4502" tiff:ImageWidth="3002" tiff:Make="Canon" tiff:Model="Canon EOS 6D" tiff:ResolutionUnit="2" tiff:XResolution="240/1" tiff:YResolution="240/1" xap:CreateDate="2015-04-08T09:06:03.00+02:00" xap:CreatorTool="Adobe Photoshop Lightroom" xap:ModifyDate="2015-04-08T11:36:04+02:00" xap:Rating="4" xapRights:Marked="True" xapRights:WebStatement=""
xmlns:aux="http://ns.adobe.com/exif/1.0/aux/"
xmlns:crs="http://ns.adobe.com/camera-raw-settings/1.0/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:exif="http://ns.adobe.com/exif/1.0/"
xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
xmlns:xap="http://ns.adobe.com/xap/1.0/"
xmlns:xapRights="http://ns.adobe.com/xap/1.0/rights/">
<exif:ISOSpeedRatings>
<rdf:Seq>
<rdf:li>50</rdf:li>
</rdf:Seq>
</exif:ISOSpeedRatings>
<exif:Flash exif:Fired="False" exif:Function="False" exif:Mode="2" exif:RedEyeMode="False" exif:Return="0"></exif:Flash>
<dc:creator>
<rdf:Seq>
<rdf:li></rdf:li>
</rdf:Seq>
</dc:creator>
<dc:rights>
<rdf:Alt>
<rdf:li xml:lang="x-default"></rdf:li>
</rdf:Alt>
</dc:rights>
<dc:subject>
<rdf:Bag>
<rdf:li>tag 1, tag 2</rdf:li>
</rdf:Bag>
</dc:subject>
<crs:ToneCurve>
<rdf:Seq>
<rdf:li>0, 0</rdf:li>
<rdf:li>255, 255</rdf:li>
</rdf:Seq>
</crs:ToneCurve>
<crs:GradientBasedCorrections>
<rdf:Seq>
<rdf:li>
<rdf:Description crs:CorrectionActive="true" crs:CorrectionAmount="1.000000" crs:LocalBrightness="-0.161000" crs:LocalClarity="-0.821000" crs:LocalContrast="0.000000" crs:LocalExposure="0.000000" crs:LocalSaturation="0.000000" crs:LocalSharpness="0.000000" crs:LocalToningHue="240.000000" crs:LocalToningSaturation="0.000000" crs:What="Correction">
<crs:CorrectionMasks>
<rdf:Seq>
<rdf:li crs:FullX="0.648456" crs:FullY="0.886053" crs:MaskValue="1.000000" crs:What="Mask/Gradient" crs:ZeroX="0.558366" crs:ZeroY="0.450461"></rdf:li>
</rdf:Seq>
</crs:CorrectionMasks>
</rdf:Description>
</rdf:li>
<rdf:li>
<rdf:Description crs:CorrectionActive="true" crs:CorrectionAmount="1.000000" crs:LocalBrightness="-0.143000" crs:LocalClarity="-0.625000" crs:LocalContrast="0.000000" crs:LocalExposure="0.000000" crs:LocalSaturation="0.000000" crs:LocalSharpness="0.000000" crs:LocalToningHue="240.000000" crs:LocalToningSaturation="0.000000" crs:What="Correction">
<crs:CorrectionMasks>
<rdf:Seq>
<rdf:li crs:FullX="0.766335" crs:FullY="0.162813" crs:MaskValue="1.000000" crs:What="Mask/Gradient" crs:ZeroX="0.652886" crs:ZeroY="0.571186"></rdf:li>
</rdf:Seq>
</crs:CorrectionMasks>
</rdf:Description>
</rdf:li>
<rdf:li>
<rdf:Description crs:CorrectionActive="true" crs:CorrectionAmount="1.000000" crs:LocalBrightness="0.250000" crs:LocalClarity="-0.893000" crs:LocalContrast="0.000000" crs:LocalExposure="0.000000" crs:LocalSaturation="0.000000" crs:LocalSharpness="0.000000" crs:LocalToningHue="240.000000" crs:LocalToningSaturation="0.000000" crs:What="Correction">
<crs:CorrectionMasks>
<rdf:Seq>
<rdf:li crs:FullX="0.077976" crs:FullY="0.326289" crs:MaskValue="1.000000" crs:What="Mask/Gradient" crs:ZeroX="0.214516" crs:ZeroY="0.370260"></rdf:li>
</rdf:Seq>
</crs:CorrectionMasks>
</rdf:Description>
</rdf:li>
</rdf:Seq>
</crs:GradientBasedCorrections>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>