diff --git a/repository/Grafoscopio/ExternalApp.class.st b/repository/Grafoscopio/ExternalApp.class.st
index 6c376af..0586574 100644
--- a/repository/Grafoscopio/ExternalApp.class.st
+++ b/repository/Grafoscopio/ExternalApp.class.st
@@ -17,6 +17,14 @@ Class {
 	#category : #'Grafoscopio-Model'
 }
 
+{ #category : #installation }
+ExternalApp class >> compareHashFor: aFileName with: aSHAString [
+	
+	aSHAString  = (SHA1 new hashMessage: aFileName asFileReference binaryReadStream contents) hex
+		ifFalse: [ ^ false ]
+		ifTrue: [ ^ true ].
+]
+
 { #category : #configuration }
 ExternalApp class >> configureFossil [
 	"Stablish where is located pandoc according to the operative system and/or the input of the user"
@@ -41,14 +49,6 @@ ExternalApp class >> configurePandoc [
 
 ]
 
-{ #category : #installation }
-ExternalApp class >> file: aFileName hasHash: aSHAString [
-	
-	aSHAString  = (SHA1 new hashMessage: aFileName asFileReference binaryReadStream contents) hex
-		ifFalse: [ ^ false ]
-		ifTrue: [ ^ true ].
-]
-
 { #category : #installation }
 ExternalApp class >> installSQLite32Bits [
 	"I dowload the SQLite binary for the hosting platform, uncompress it and made it available as with the name
diff --git a/repository/Grafoscopio/FossilRepo.class.st b/repository/Grafoscopio/FossilRepo.class.st
new file mode 100644
index 0000000..9369fdd
--- /dev/null
+++ b/repository/Grafoscopio/FossilRepo.class.st
@@ -0,0 +1,42 @@
+"
+I model a fossil repository. For details about fossil see:
+
+http://fossil-scm.org/
+"
+Class {
+	#name : #FossilRepo,
+	#superclass : #Object,
+	#instVars : [
+		'url'
+	],
+	#category : #'Grafoscopio-Model'
+}
+
+{ #category : #'as yet unclassified' }
+FossilRepo >> jsonDataFor: aFileName [
+	^ NeoJSONReader fromString: (self jsonStringFor: aFileName) 
+]
+
+{ #category : #'as yet unclassified' }
+FossilRepo >> jsonStringFor: aFileName [
+	| queryForJSONData |
+	queryForJSONData := self url addPathSegments: #('json' 'finfo').
+	queryForJSONData queryAt: 'name' put: aFileName.
+	^ (ZnEasy get: queryForJSONData) contents.
+]
+
+{ #category : #'as yet unclassified' }
+FossilRepo >> lastHashNumberFor: aFileName [
+	(self jsonDataFor: aFileName)  at: 'payload' ifAbsent: [ self inform: 'Key not found, verify the file name you are looking in this repository'. ^ self ].
+	^ (((self jsonDataFor: aFileName)  at: 'payload') at: 'checkins') first at: 'uuid'
+]
+
+{ #category : #accessing }
+FossilRepo >> url [
+	^ url
+]
+
+{ #category : #accessing }
+FossilRepo >> url: aString [
+	url := aString asUrl 
+]