Change isDirectory to fileKind enumeration

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 isDirectory property is specified and set to true, then the file represents a directory and all content stored in that directory.
+The fileKind property can be set to `directory` to indicate the file represents a directory and all content stored in that directory.
 
 ## Metadata
 
@@ -24,8 +24,8 @@ If the isDirectory property is specified and set to true, then the file represen
   - type: /Core/MediaType
   - minCount: 0
   - maxCount: 1
-- isDirectory
-  - type: xsd:boolean
+- fileKind
+  - type: FileKindType
   - minCount: 0
   - maxCount: 1
 

model/Software/Properties/fileKind.md

@@ -0,0 +1,18 @@
+SPDX-License-Identifier: Community-Spec-1.0
+
+# fileKind
+
+## Summary
+
+Describes if a given file is a directory or non-directory kind of file.
+
+## Description
+
+An SPDX file may represent a specific file or a directory of files.  In the future, this may be extended to other kinds (e.g. network based files).
+
+## Metadata
+
+- name: fileKind
+- Nature: ObjectProperty
+- Range: FileKindType
+

model/Software/Vocabularies/FileKindType.md

@@ -0,0 +1,20 @@
+SPDX-License-Identifier: Community-Spec-1.0
+
+# FileKindType
+
+## Summary
+
+Enumeration of the different kinds of SPDX file.
+
+## Description
+
+An SPDX file may represent a file on disk or a directory of files.  In the future, this may be extended to other kinds (e.g. network based files).
+
+## Metadata
+
+- name: FileKindType
+
+## Entries
+
+- file: The file represents a single file (default).
+- directory: The file represents a directory and all content stored in that directory.