diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/markedcontent/PBOpMarkedContent.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/markedcontent/PBOpMarkedContent.java
index 3d15152f..f81a6883 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/markedcontent/PBOpMarkedContent.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/markedcontent/PBOpMarkedContent.java
@@ -61,6 +61,7 @@ public abstract class PBOpMarkedContent extends PBOperator implements
 	public static final String LANG = "Lang";
 	/** Name of link to ActualText value from the properties dictionary */
 	public static final String ACTUAL_TEXT = "actualText";
+	public static final String ALT = "alt";
 
 	public PBOpMarkedContent(List<COSBase> arguments, final String opType, PDDocument document, PDFAFlavour flavour) {
         super(arguments, opType);
@@ -88,6 +89,8 @@ public List<? extends Object> getLinkedObjects(String link) {
 		switch (link) {
 			case ACTUAL_TEXT:
 				return this.getactualText();
+			case ALT:
+				return Collections.emptyList();				
 			default:
 				return super.getLinkedObjects(link);
 		}
diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/textshow/PBGlyph.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/textshow/PBGlyph.java
index 3d55b8ab..b2e43f2a 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/textshow/PBGlyph.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/operator/textshow/PBGlyph.java
@@ -152,4 +152,9 @@ public Boolean getactualTextPresent() {
 		// actual text obtaining should be implemented
 		return Boolean.FALSE;
 	}
+
+	@Override
+	public Boolean getaltPresent() {
+		return null;
+	}
 }
\ No newline at end of file
diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java
index 7dfdb267..f22921e4 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java
@@ -81,6 +81,7 @@ public class PBoxPDStructElem extends PBoxPDObject implements PDStructElem {
 	 * Link name for {@code ActualText} key
 	 */
 	public static final String ACTUAL_TEXT = "actualText";
+	public static final String ALT = "alt";
 
 	private TaggedPDFRoleMapHelper roleMapHelper;
 
@@ -267,7 +268,9 @@ public List<? extends Object> getLinkedObjects(String link) {
 		case LANG:
 			return this.getLang();
 		case ACTUAL_TEXT:
-			return this.getactualText();
+			return this.getactualText(); 
+		case ALT:
+			return Collections.emptyList();			
 		default:
 			return super.getLinkedObjects(link);
 		}