diff --git a/src/sssom_schema/schema/sssom_schema.yaml b/src/sssom_schema/schema/sssom_schema.yaml
index 877ae9e5..3633ca65 100644
--- a/src/sssom_schema/schema/sssom_schema.yaml
+++ b/src/sssom_schema/schema/sssom_schema.yaml
@@ -49,6 +49,7 @@ enums:
         meaning: rdfs:Datatype
       rdf property:
         meaning: rdf:Property
+      sssom literal: A special type of literal that is used in SSSOM files to express that the subject_id is not an entity reference.
   predicate_modifier_enum:
     permissible_values:
       Not: Negating the mapping predicate. The meaning of the triple becomes subject_id is not a predicate_id match to object_id.
@@ -118,15 +119,17 @@ slots:
   subject_id:
     description: The ID of the subject of the mapping.
     range: EntityReference
-    required: true
     mappings:
     - owl:annotatedSource
     slot_uri: owl:annotatedSource
     examples:
       - value: HP:0009894
         description: The CURIE denoting the Human Phenotype Ontology concept of 'Thickened ears'
-  literal:
+  subject_literal:
     description: The literal being mapped
+    see_also:
+    - https://mapping-commons.github.io/sssom/sssom-profiles/
+    - https://github.com/mapping-commons/sssom/issues/234
     range: string
     required: true
     mappings:
@@ -135,7 +138,7 @@ slots:
     examples:
       - value: "Alzheimer"
         description: A string referring to some thing.
-  literal_datatype:
+  subject_literal_datatype:
     description: The datatype of the literal being mapped
     range: uri
     required: false
@@ -386,20 +389,6 @@ slots:
     examples:
       - value: http://purl.obolibrary.org/obo/mondo/releases/2021-01-30/mondo.owl
         description: (A persistent Version IRI pointing to the Mondo version '2021-01-30')
-  literal_source:
-    description: URI of ontology source for the literal.
-    range: EntityReference
-    examples:
-      - value: obo:mondo.owl
-        description: A persistent OBO CURIE pointing to the latest version of the Mondo ontology.
-      - value: wikidata:Q7876491
-        description: A Wikidata identifier for the Uberon ontology resource.
-  literal_source_version:
-    description: Version IRI or version string of the source of the literal.
-    range: string
-    examples:
-      - value: http://purl.obolibrary.org/obo/mondo/releases/2021-01-30/mondo.owl
-        description: (A persistent Version IRI pointing to the Mondo version '2021-01-30')
   object_source:
     description: URI of vocabulary or identifier source for the object.
     range: EntityReference
@@ -526,13 +515,6 @@ slots:
     examples:
       - value: semapv:Stemming
       - value: semapv:StopWordRemoval
-  literal_preprocessing:
-    description: Method of preprocessing applied to the literal.
-    range: EntityReference
-    multivalued: true
-    examples:
-      - value: semapv:Stemming
-      - value: semapv:StopWordRemoval
   curation_rule:
     description: A curation rule is a (potentially) complex condition executed by an agent that led to the establishment of a mapping. 
       Curation rules often involve complex domain-specific considerations, which are hard to capture in an automated fashion. The curation
@@ -661,6 +643,8 @@ classes:
     - subject_id
     - subject_label
     - subject_category
+    - subject_literal
+    - subject_literal_datatype
     - predicate_id
     - predicate_label
     - predicate_modifier
@@ -698,52 +682,10 @@ classes:
     - object_preprocessing
     - semantic_similarity_score
     - semantic_similarity_measure
-    - see_also
-    - issue_tracker_item
-    - other
-    - comment
-    class_uri: owl:Axiom
-  literal mapping:
-    description: Represents an individual mapping between a literal and an entity. 
-      Note that this schema has been created on 01.08.2023 and is subject to change.
-    see_also:
-    - https://mapping-commons.github.io/sssom/sssom-profiles/
-    slots:
-    - literal
-    - literal_datatype
-    - predicate_id
-    - predicate_label
-    - predicate_modifier
-    - object_id
-    - object_label
-    - object_category
-    - mapping_justification
-    - author_id
-    - author_label
-    - reviewer_id
-    - reviewer_label
-    - creator_id
-    - creator_label
-    - license
-    - literal_source
-    - literal_source_version
-    - object_type
-    - object_source
-    - object_source_version
-    - mapping_provider
-    - mapping_source
-    - mapping_cardinality
-    - mapping_tool
-    - mapping_tool_version
-    - mapping_date
-    - confidence
-    - object_match_field
-    - match_string
-    - literal_preprocessing
-    - object_preprocessing
     - similarity_score
     - similarity_measure
     - see_also
+    - issue_tracker_item
     - other
     - comment
     class_uri: owl:Axiom