diff --git a/src/main/java/org/dita/dost/platform/ImportAntLibAction.java b/src/main/java/org/dita/dost/platform/ImportAntLibAction.java
index a06d4727ee..ed89dd7a2a 100644
--- a/src/main/java/org/dita/dost/platform/ImportAntLibAction.java
+++ b/src/main/java/org/dita/dost/platform/ImportAntLibAction.java
@@ -11,7 +11,6 @@
 import static javax.xml.XMLConstants.NULL_NS_URI;
 import static org.dita.dost.util.XMLUtils.AttributesBuilder;
 
-import java.io.File;
 import org.dita.dost.util.FileUtils;
 import org.xml.sax.ContentHandler;
 import org.xml.sax.SAXException;
@@ -29,7 +28,13 @@ final class ImportAntLibAction extends ImportAction {
   public void getResult(final ContentHandler retBuf) throws SAXException {
     final String templateFilePath = paramTable.get(FileGenerator.PARAM_TEMPLATE);
     for (final Value value : valueSet) {
-      final String path = ((Value.PathValue) value).baseDir() + File.separator + value.value();
+      final String path;
+      if (value instanceof Value.PathValue pathValue) {
+        path = pathValue.getPath();
+      } else {
+        logger.error("Ant import must be a file feature: " + value.value());
+        continue;
+      }
       final String resolvedValue = FileUtils.getRelativeUnixPath(templateFilePath, path);
       if (FileUtils.isAbsolutePath(resolvedValue)) {
         // if resolvedValue is absolute path
diff --git a/src/main/java/org/dita/dost/platform/ImportCatalogActionRelative.java b/src/main/java/org/dita/dost/platform/ImportCatalogActionRelative.java
index f881fbbae6..d5bdecbbc1 100644
--- a/src/main/java/org/dita/dost/platform/ImportCatalogActionRelative.java
+++ b/src/main/java/org/dita/dost/platform/ImportCatalogActionRelative.java
@@ -9,7 +9,6 @@
 
 import static org.dita.dost.util.Constants.OASIS_CATALOG_NAMESPACE;
 
-import java.io.File;
 import org.dita.dost.util.FileUtils;
 import org.dita.dost.util.XMLUtils.AttributesBuilder;
 import org.xml.sax.ContentHandler;
@@ -27,7 +26,13 @@ final class ImportCatalogActionRelative extends ImportAction {
   public void getResult(final ContentHandler buf) throws SAXException {
     final String templateFilePath = paramTable.get(FileGenerator.PARAM_TEMPLATE);
     for (final Value value : valueSet) {
-      final String path = ((Value.PathValue) value).baseDir() + File.separator + value.value();
+      final String path;
+      if (value instanceof Value.PathValue pathValue) {
+        path = pathValue.getPath();
+      } else {
+        logger.error("Catalog import must be a file feature: " + value.value());
+        continue;
+      }
       buf.startElement(
         OASIS_CATALOG_NAMESPACE,
         "nextCatalog",
diff --git a/src/main/java/org/dita/dost/platform/ImportStringsAction.java b/src/main/java/org/dita/dost/platform/ImportStringsAction.java
index 0fdff5c9c3..0f9ba6b3df 100644
--- a/src/main/java/org/dita/dost/platform/ImportStringsAction.java
+++ b/src/main/java/org/dita/dost/platform/ImportStringsAction.java
@@ -10,7 +10,6 @@
 
 import static javax.xml.XMLConstants.NULL_NS_URI;
 
-import java.io.File;
 import org.dita.dost.util.FileUtils;
 import org.dita.dost.util.XMLUtils.AttributesBuilder;
 import org.xml.sax.ContentHandler;
@@ -29,8 +28,14 @@ final class ImportStringsAction extends ImportAction {
   public void getResult(final ContentHandler buf) throws SAXException {
     final String templateFilePath = paramTable.get(FileGenerator.PARAM_TEMPLATE);
     for (final Value value : valueSet) {
+      final String path;
+      if (value instanceof Value.PathValue pathValue) {
+        path = pathValue.getPath();
+      } else {
+        logger.error("String import must be a file feature: " + value.value());
+        continue;
+      }
       buf.startElement(NULL_NS_URI, "stringfile", "stringfile", new AttributesBuilder().build());
-      final String path = ((Value.PathValue) value).baseDir() + File.separator + value.value();
       final char[] location = FileUtils.getRelativeUnixPath(templateFilePath, path).toCharArray();
       buf.characters(location, 0, location.length);
       buf.endElement(NULL_NS_URI, "stringfile", "stringfile");
diff --git a/src/main/java/org/dita/dost/platform/ImportXSLAction.java b/src/main/java/org/dita/dost/platform/ImportXSLAction.java
index b9e282a601..303f240cfc 100644
--- a/src/main/java/org/dita/dost/platform/ImportXSLAction.java
+++ b/src/main/java/org/dita/dost/platform/ImportXSLAction.java
@@ -8,7 +8,6 @@
  */
 package org.dita.dost.platform;
 
-import java.io.File;
 import java.net.URI;
 import org.dita.dost.platform.Value.PathValue;
 import org.dita.dost.util.FileUtils;
@@ -47,7 +46,7 @@ public void getResult(final ContentHandler buf) throws SAXException {
   private URI getHref(final PathValue value) {
     final Plugin features = featureTable.get(value.pluginId());
     final URI pluginDir = features.pluginDir().toURI();
-    final String path = value.baseDir() + File.separator + value.value();
+    final String path = value.getPath();
     final URI templateFile = URLUtils.toFile(path).toURI().normalize();
     final URI template = pluginDir.relativize(templateFile);
     if (value.pluginId() == null || template.isAbsolute()) {
diff --git a/src/main/java/org/dita/dost/platform/InsertAction.java b/src/main/java/org/dita/dost/platform/InsertAction.java
index 4f07667d56..ec1ddb2d98 100644
--- a/src/main/java/org/dita/dost/platform/InsertAction.java
+++ b/src/main/java/org/dita/dost/platform/InsertAction.java
@@ -8,7 +8,6 @@
  */
 package org.dita.dost.platform;
 
-import java.io.File;
 import java.io.IOException;
 import java.io.UncheckedIOException;
 import java.util.*;
@@ -71,7 +70,12 @@ public void getResult(final ContentHandler retBuf) throws SAXException {
     setContentHandler(retBuf);
     try {
       for (final Value fileName : fileNameSet) {
-        currentFile = ((Value.PathValue) fileName).baseDir() + File.separator + fileName.value();
+        if (fileName instanceof Value.PathValue pathValue) {
+          currentFile = pathValue.getPath();
+        } else {
+          logger.error("Catalog import must be a file feature: " + fileName.value());
+          continue;
+        }
         reader.parse(currentFile);
       }
     } catch (SAXException | RuntimeException e) {
diff --git a/src/main/java/org/dita/dost/platform/Integrator.java b/src/main/java/org/dita/dost/platform/Integrator.java
index 0bd25e4f73..528008a3b8 100644
--- a/src/main/java/org/dita/dost/platform/Integrator.java
+++ b/src/main/java/org/dita/dost/platform/Integrator.java
@@ -33,6 +33,7 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
 import javax.xml.XMLConstants;
@@ -649,7 +650,14 @@ private Collection<File> relativize(final Collection<Value> src) {
     final File base = new File(ditaDir, "dummy");
     return src
       .stream()
-      .map(lib -> toFile(((Value.PathValue) lib).baseDir() + File.separator + lib.value()))
+      .flatMap(lib -> {
+        if (lib instanceof Value.PathValue path) {
+          return Stream.of(toFile(path.getPath()));
+        } else {
+          logger.error("Library import must be a file feature: " + lib.value());
+          return Stream.empty();
+        }
+      })
       .map(libFile -> {
         if (!libFile.exists()) {
           throw new IllegalArgumentException("Library file not found: " + libFile.getAbsolutePath());
diff --git a/src/main/java/org/dita/dost/platform/Value.java b/src/main/java/org/dita/dost/platform/Value.java
index 7813df8c67..9ef43c0af2 100644
--- a/src/main/java/org/dita/dost/platform/Value.java
+++ b/src/main/java/org/dita/dost/platform/Value.java
@@ -16,5 +16,9 @@ public sealed interface Value {
 
   record StringValue(String pluginId, String value) implements Value {}
 
-  record PathValue(String pluginId, File baseDir, String value) implements Value {}
+  record PathValue(String pluginId, File baseDir, String value) implements Value {
+    public String getPath() {
+      return baseDir + File.separator + value;
+    }
+  }
 }