diff --git a/corefunc/str_iterative_replace.go b/corefunc/str_iterative_replace.go
index 3d888154..7e26ddc0 100644
--- a/corefunc/str_iterative_replace.go
+++ b/corefunc/str_iterative_replace.go
@@ -14,34 +14,25 @@
 
 package corefunc
 
-import "strings"
+import (
+	"strings"
+
+	"github.com/northwood-labs/terraform-provider-corefunc/corefunc/types"
+)
 
 /*
 StrIterativeReplace iterates over a list of replacements. This allows you to
 accept a list of replacements of unknown length from users, and apply them all
 in sequence. It is a wrapper around `strings.ReplaceAll()`.
 
-Unfortunately, we need to apply the `tfsdk` text every time we invoke this
-anonymous struct. As it turns out, Go treats this as part of its signature. Need
-to see if an interface will improve this syntactic mess.
-
-	[]struct {
-	    Old string `tfsdk:"old"`
-	    New string `tfsdk:"new"`
-	}
-
 ----
 
   - str (string): The string to which we apply the replacements.
 
-  - replacements ([]TypeStrIterativeReplace): A list of replacements to apply to
+  - replacements ([]types.Replacement): A list of replacements to apply to
     the string, in sequence.
 */
-func StrIterativeReplace(str string, replacements []struct {
-	Old string `tfsdk:"old"`
-	New string `tfsdk:"new"`
-},
-) string { // lint:allow_format
+func StrIterativeReplace(str string, replacements []types.Replacement) string {
 	s := str
 
 	for i := range replacements {
diff --git a/corefunc/str_iterative_replace_test.go b/corefunc/str_iterative_replace_test.go
index b2fc3e04..028c9ccc 100644
--- a/corefunc/str_iterative_replace_test.go
+++ b/corefunc/str_iterative_replace_test.go
@@ -18,16 +18,14 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/northwood-labs/terraform-provider-corefunc/corefunc/types"
 	"github.com/northwood-labs/terraform-provider-corefunc/testfixtures"
 )
 
 func ExampleStrIterativeReplace() {
 	output := StrIterativeReplace(
 		"This is a string for testing replacements. New Relic. Set-up.",
-		[]struct {
-			Old string `tfsdk:"old"`
-			New string `tfsdk:"new"`
-		}{
+		[]types.Replacement{
 			{Old: ".", New: ""},
 			{Old: " ", New: "_"},
 			{Old: "-", New: "_"},
@@ -94,10 +92,7 @@ func FuzzStrIterativeReplace(f *testing.F) {
 
 	f.Fuzz(
 		func(t *testing.T, in string) {
-			_ = StrIterativeReplace(in, []struct {
-				Old string `tfsdk:"old"`
-				New string `tfsdk:"new"`
-			}{
+			_ = StrIterativeReplace(in, []types.Replacement{
 				{Old: in, New: in},
 			})
 		},
diff --git a/corefunc/types/str_iterative_replace_map.go b/corefunc/types/str_iterative_replace_map.go
new file mode 100644
index 00000000..43269e19
--- /dev/null
+++ b/corefunc/types/str_iterative_replace_map.go
@@ -0,0 +1,21 @@
+// Copyright 2023, Ryan Parman
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package types
+
+// Replacement simplifies the creation of a `map[string]string` with validation.
+type Replacement struct {
+	Old string `tfsdk:"old"`
+	New string `tfsdk:"new"`
+}
diff --git a/corefuncprovider/str_iterative_replace_data_source.go b/corefuncprovider/str_iterative_replace_data_source.go
index 581ed4fc..8c4b900f 100644
--- a/corefuncprovider/str_iterative_replace_data_source.go
+++ b/corefuncprovider/str_iterative_replace_data_source.go
@@ -27,6 +27,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-log/tflog"
 	"github.com/lithammer/dedent"
 	"github.com/northwood-labs/terraform-provider-corefunc/corefunc"
+	cfTypes "github.com/northwood-labs/terraform-provider-corefunc/corefunc/types"
 )
 
 // Ensure the implementation satisfies the expected interfaces.
@@ -41,13 +42,10 @@ type (
 
 	// strIterativeReplaceDataSourceModel maps the data source schema data.
 	strIterativeReplaceDataSourceModel struct {
-		ID           types.Int64  `tfsdk:"id"`
-		String       types.String `tfsdk:"string"`
-		Value        types.String `tfsdk:"value"`
-		Replacements []struct {
-			Old string `tfsdk:"old"`
-			New string `tfsdk:"new"`
-		} `tfsdk:"replacements"`
+		ID           types.Int64           `tfsdk:"id"`
+		String       types.String          `tfsdk:"string"`
+		Value        types.String          `tfsdk:"value"`
+		Replacements []cfTypes.Replacement `tfsdk:"replacements"`
 	}
 )
 
diff --git a/testfixtures/str_iterative_replace.go b/testfixtures/str_iterative_replace.go
index 7fd1d210..a8a0d4bc 100644
--- a/testfixtures/str_iterative_replace.go
+++ b/testfixtures/str_iterative_replace.go
@@ -14,23 +14,19 @@
 
 package testfixtures // lint:no_dupe
 
-// StrIterativeReplaceTestTable is used by both the standard Go tests and also the
-// Terraform acceptance tests.
+import "github.com/northwood-labs/terraform-provider-corefunc/corefunc/types"
+
+// StrIterativeReplaceTestTable is used by both the standard Go tests and also
+// the Terraform acceptance tests.
 // <https://github.com/golang/go/wiki/TableDrivenTests>
 var StrIterativeReplaceTestTable = map[string]struct { // lint:no_dupe
-	Replacements []struct {
-		Old string `tfsdk:"old"`
-		New string `tfsdk:"new"`
-	}
-	Input    string
-	Expected string
+	Replacements []types.Replacement
+	Input        string
+	Expected     string
 }{
 	"replacements": {
 		Input: "This is a string for testing replacements. New Relic. Set-up.",
-		Replacements: []struct {
-			Old string `tfsdk:"old"`
-			New string `tfsdk:"new"`
-		}{
+		Replacements: []types.Replacement{
 			{Old: ".", New: ""},
 			{Old: " ", New: "_"},
 			{Old: "-", New: "_"},