Add isDirectory optional property to file

Signed-off-by: Gary O'Neall <[email protected]>

model/Software/Classes/File.md

@@ -11,7 +11,7 @@ Refers to any object that stores content on a computer.
 Refers to any object that stores content on a computer.
 The type of content can optionally be provided in the contentType property.
 
-If the file reference a directory, then the file represents the directory and all content stored in that directory.
+If the isDirectory is specified and set to true, then the file represents the directory and all content stored in that directory.
 
 ## Metadata
 
@@ -24,9 +24,12 @@ If the file reference a directory, then the file represents the directory and al
   - type: /Core/MediaType
   - minCount: 0
   - maxCount: 1
+- isDirectory
+  - type: xsd:boolean
+  - minCount: 0
+  - maxCount: 1
 
 ## External properties restrictions
 
 - /Core/Element/name
   - minCount: 1
-

model/Software/Properties/isDirectory.md

@@ -0,0 +1,18 @@
+SPDX-License-Identifier: Community-Spec-1.0
+
+# isDirectory
+
+## Summary
+
+If true, denotes the Element is a directory.
+
+## Description
+
+If true, denotes the Element is a directory.
+
+## Metadata
+
+- name: isDirectory
+- Nature: DataProperty
+- Range: xsd:boolean
+