diff --git a/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj b/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
index 347853e3c..41c5f488d 100644
--- a/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
+++ b/tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
@@ -44,6 +44,7 @@
     <Compile Include="StructuralTypes.fs" />
     <Compile Include="BaseTypesHtmlDocument.fs" />
     <Compile Include="XmlExtensions.fs" />
+    <Compile Include="XmlInference.fs" />
     <Compile Include="XmlRuntime.fs" />
     <Compile Include="XmlSchema.fs" />
     <Compile Include="WorldBankRuntime.fs" />
@@ -60,6 +61,7 @@
     <ProjectReference Include="..\..\src\FSharp.Data.Csv.Core\FSharp.Data.Csv.Core.fsproj" />
     <ProjectReference Include="..\..\src\FSharp.Data.Html.Core\FSharp.Data.Html.Core.fsproj" />
     <ProjectReference Include="..\..\src\FSharp.Data.WorldBank.Core\FSharp.Data.WorldBank.Core.fsproj" />
+    <ProjectReference Include="..\..\src\FSharp.Data.DesignTime\FSharp.Data.DesignTime.fsproj" />
   </ItemGroup>
   <ItemGroup>
     <PackageReference Update="FSharp.Core" Version="6.0.1" />
diff --git a/tests/FSharp.Data.Core.Tests/XmlInference.fs b/tests/FSharp.Data.Core.Tests/XmlInference.fs
new file mode 100644
index 000000000..7326f83a3
--- /dev/null
+++ b/tests/FSharp.Data.Core.Tests/XmlInference.fs
@@ -0,0 +1,327 @@
+module FSharp.Data.Core.Tests.XmlInference
+
+open FsUnit
+open NUnit.Framework
+open System
+open System.Xml.Linq
+open FSharp.Data
+open FSharp.Data.Runtime
+open FSharp.Data.Runtime.StructuralTypes
+open FSharp.Data.Runtime.StructuralInference
+open ProviderImplementation
+
+// Test infrastructure similar to InferenceTests.fs
+let internal culture = TextRuntime.GetCulture ""
+let internal inferenceMode = InferenceMode'.ValuesOnly
+let internal unitsOfMeasureProvider = 
+    { new StructuralInference.IUnitsOfMeasureProvider with
+        member x.SI(_) : System.Type = null
+        member x.Product(_, _) = failwith "Not implemented yet"
+        member x.Inverse(_) = failwith "Not implemented yet" }
+let internal allowEmptyValues = true
+
+// Helper function to create XElement from string
+let createElement xmlString =
+    XElement.Parse(xmlString)
+
+// Helper function to create XElement array
+let createElements xmlStrings =
+    xmlStrings |> Array.map createElement
+
+[<Test>]
+let ``getInferedTypeFromValue handles simple string value`` () =
+    let element = createElement """<name>John</name>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<string>
+    | _ -> failwith "Expected primitive string type"
+
+[<Test>]
+let ``getInferedTypeFromValue handles numeric value`` () =
+    let element = createElement """<age>30</age>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<int>
+    | _ -> failwith "Expected primitive int type"
+
+[<Test>]
+let ``getInferedTypeFromValue handles boolean value`` () =
+    let element = createElement """<active>true</active>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<bool>
+    | _ -> failwith "Expected primitive bool type"
+
+[<Test>]
+let ``getInferedTypeFromValue handles decimal value`` () =
+    let element = createElement """<price>19.99</price>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<decimal>
+    | _ -> failwith "Expected primitive decimal type"
+
+[<Test>]
+let ``getInferedTypeFromValue handles embedded JSON object`` () =
+    let element = createElement """<data>{"name": "John", "age": 30}</data>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Json(_, _) -> () // Success - embedded JSON detected
+    | _ -> failwith "Expected JSON type for embedded JSON content"
+
+[<Test>]
+let ``getInferedTypeFromValue handles embedded JSON array`` () =
+    let element = createElement """<items>[1, 2, 3]</items>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Json(_, _) -> () // Success - embedded JSON detected  
+    | _ -> failwith "Expected JSON type for embedded JSON array"
+
+[<Test>]
+let ``getInferedTypeFromValue with NoInference mode skips JSON parsing`` () =
+    let element = createElement """<data>{"name": "John"}</data>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider InferenceMode'.NoInference culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<string>
+    | _ -> failwith "Expected string type with NoInference mode"
+
+[<Test>]
+let ``getInferedTypeFromValue handles malformed JSON as string`` () =
+    let element = createElement """<data>{"name": invalid}</data>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<string>
+    | _ -> failwith "Expected string type for malformed JSON"
+
+[<Test>]
+let ``getInferedTypeFromValue handles empty element`` () =
+    let element = createElement """<empty></empty>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    // For empty elements, the inference returns Null type
+    match result with
+    | InferedType.Null -> () // Success - empty value gives Null type
+    | _ -> failwithf "Expected Null type for empty value, got %A" result
+
+[<Test>]
+let ``inferLocalType handles simple element with content`` () =
+    let element = createElement """<name>John</name>"""
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "name"
+        properties.Length |> should equal 1
+        properties.[0].Name |> should equal ""  // Body content
+    | _ -> failwith "Expected record type with body content"
+
+[<Test>]
+let ``inferLocalType handles element with attributes`` () =
+    let element = createElement """<person name="John" age="30">Developer</person>"""
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "person"
+        properties.Length |> should equal 3  // body content + 2 attributes
+        properties |> List.exists (fun p -> p.Name = "name") |> should equal true
+        properties |> List.exists (fun p -> p.Name = "age") |> should equal true
+        properties |> List.exists (fun p -> p.Name = "") |> should equal true  // body
+    | _ -> failwith "Expected record type with attributes and body"
+
+[<Test>]
+let ``inferLocalType handles element with child elements`` () =
+    let element = createElement """<person><name>John</name><age>30</age></person>"""
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "person"
+        properties.Length |> should equal 1  // Collection of children
+        properties.[0].Name |> should equal ""  // Body content (collection)
+        match properties.[0].Type with
+        | InferedType.Collection(_, _) -> () // Success - collection of children
+        | _ -> failwith "Expected collection type for child elements"
+    | _ -> failwith "Expected record type with child collection"
+
+[<Test>]
+let ``inferLocalType handles empty element`` () =
+    let element = createElement """<empty />"""
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "empty"
+        properties.Length |> should equal 0  // No content or attributes
+    | _ -> failwith "Expected empty record type"
+
+[<Test>]
+let ``inferLocalType handles element with only attributes`` () =
+    let element = createElement """<config debug="true" timeout="30" />"""
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "config"
+        properties.Length |> should equal 2  // 2 attributes, no body
+        properties |> List.exists (fun p -> p.Name = "debug") |> should equal true
+        properties |> List.exists (fun p -> p.Name = "timeout") |> should equal true
+    | _ -> failwith "Expected record type with attributes only"
+
+[<Test>]
+let ``inferLocalType handles nested structure`` () =
+    let element = createElement """<root><item id="1"><value>test</value></item><item id="2"><value>test2</value></item></root>"""
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "root"
+        properties.Length |> should equal 1
+        match properties.[0].Type with
+        | InferedType.Collection(_, _) -> () // Collection of items
+        | _ -> failwith "Expected collection of items"
+    | _ -> failwith "Expected root record with item collection"
+
+[<Test>]
+let ``inferGlobalType handles single element`` () =
+    let doc = XDocument.Parse("""<root><person name="John">Developer</person></root>""")
+    let elements = [| doc.Root |]
+    let result = XmlInference.inferGlobalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues elements
+    
+    result.Length |> should equal 1
+    match result.[0] with
+    | InferedType.Record(Some name, _, false) ->
+        name |> should equal "root"
+    | _ -> failwith "Expected root record type"
+
+[<Test>]
+let ``inferGlobalType handles multiple elements of same type`` () =
+    let xml = """<doc><person name="John" age="30" /><person name="Jane" city="NYC" /></doc>"""
+    let doc = XDocument.Parse(xml)
+    let elements = [| doc.Root |]
+    let result = XmlInference.inferGlobalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues elements
+    
+    result.Length |> should equal 1
+
+[<Test>]
+let ``inferType with globalInference=true uses global inference`` () =
+    let doc = XDocument.Parse("""<root><person name="John">Developer</person></root>""")
+    let elements = [| doc.Root |]
+    let result = XmlInference.inferType unitsOfMeasureProvider inferenceMode culture allowEmptyValues true elements
+    
+    result.Length |> should equal 1
+    match result.[0] with
+    | InferedType.Record(Some name, _, false) ->
+        name |> should equal "root"
+    | _ -> failwith "Expected root record type from global inference"
+
+[<Test>]
+let ``inferType with globalInference=false uses local inference`` () =
+    let elements = [| createElement """<person name="John">Developer</person>""" |]
+    let result = XmlInference.inferType unitsOfMeasureProvider inferenceMode culture allowEmptyValues false elements
+    
+    result.Length |> should equal 1
+    match result.[0] with
+    | InferedType.Record(Some name, _, false) ->
+        name |> should equal "person"
+    | _ -> failwith "Expected person record type from local inference"
+
+[<Test>]
+let ``inferType handles multiple root elements`` () =
+    let elements = [| 
+        createElement """<person name="John">Developer</person>"""
+        createElement """<person name="Jane">Designer</person>"""
+    |]
+    let result = XmlInference.inferType unitsOfMeasureProvider inferenceMode culture allowEmptyValues false elements
+    
+    result.Length |> should equal 2
+    // Both should be person records
+    result |> Array.forall (function 
+        | InferedType.Record(Some "person", _, false) -> true 
+        | _ -> false) |> should equal true
+
+[<Test>]
+let ``XML with complex nested structure infers correctly`` () =
+    let element = createElement """
+        <library name="City Library">
+            <book id="1" category="fiction">
+                <title>The Great Gatsby</title>
+                <author>F. Scott Fitzgerald</author>
+                <year>1925</year>
+                <available>true</available>
+            </book>
+            <book id="2" category="science">
+                <title>A Brief History of Time</title>
+                <author>Stephen Hawking</author>
+                <year>1988</year>
+                <available>false</available>
+            </book>
+        </library>
+    """
+    
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "library"
+        properties |> List.exists (fun p -> p.Name = "name") |> should equal true
+        properties |> List.exists (fun p -> p.Name = "") |> should equal true // Collection of books
+    | _ -> failwith "Expected library record with books collection"
+
+[<Test>]
+let ``XML with mixed content types infers correctly`` () =
+    let element = createElement """
+        <data>
+            <number>42</number>
+            <text>Hello</text>
+            <flag>true</flag>
+            <price>19.99</price>
+        </data>
+    """
+    
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, properties, false) ->
+        name |> should equal "data"
+        properties.Length |> should equal 1  // Collection of mixed elements
+        match properties.[0].Type with
+        | InferedType.Collection(_, _) -> () // Success
+        | _ -> failwith "Expected collection of mixed elements"
+    | _ -> failwith "Expected data record with mixed content"
+
+[<Test>]
+let ``XML with namespaced elements handles correctly`` () =
+    let element = createElement """<root xmlns:ns="http://example.com"><ns:item ns:value="test">content</ns:item></root>"""
+    
+    let result = XmlInference.inferLocalType unitsOfMeasureProvider inferenceMode culture allowEmptyValues element
+    
+    match result with
+    | InferedType.Record(Some name, _, false) ->
+        name |> should equal "root"
+    | _ -> failwith "Expected root record type for namespaced XML"
+
+[<Test>]
+let ``XML inference handles large values correctly`` () =
+    let element = createElement """<data>9223372036854775807</data>"""  // Int64.MaxValue
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<int64>
+    | _ -> failwith "Expected int64 type for large integer"
+
+[<Test>]
+let ``XML inference handles floating point values`` () =
+    let element = createElement """<value>123.456789</value>"""
+    let result = XmlInference.getInferedTypeFromValue unitsOfMeasureProvider inferenceMode culture element
+    
+    match result with
+    | InferedType.Primitive(t, _, _, _) -> t |> should equal typeof<decimal>
+    | _ -> failwith "Expected decimal type for floating point"
\ No newline at end of file