diff --git a/src/models/checksum.rs b/src/models/checksum.rs
index d66bd36..95f1405 100644
--- a/src/models/checksum.rs
+++ b/src/models/checksum.rs
@@ -5,6 +5,7 @@
 use serde::{Deserialize, Serialize};
 
 /// Representation of SPDX's
+///
 /// [Package Checksum](https://spdx.github.io/spdx-spec/3-package-information/#310-package-checksum)
 /// and
 /// [File Checksum](https://spdx.github.io/spdx-spec/4-file-information/#44-file-checksum).
@@ -30,6 +31,7 @@ impl Checksum {
 }
 
 /// Possible algorithms to be used for SPDX's
+///
 /// [package checksum](https://spdx.github.io/spdx-spec/3-package-information/#310-package-checksum)
 /// and [file checksum](https://spdx.github.io/spdx-spec/4-file-information/#44-file-checksum).
 #[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Clone, Copy)]
diff --git a/src/models/file_information.rs b/src/models/file_information.rs
index 41c9578..bdb40c5 100644
--- a/src/models/file_information.rs
+++ b/src/models/file_information.rs
@@ -123,9 +123,7 @@ impl FileInformation {
             .iter()
             .find(|&checksum| checksum.algorithm == algorithm);
 
-        checksum.map_or(false, |checksum| {
-            checksum.value.to_ascii_lowercase() == value.to_ascii_lowercase()
-        })
+        checksum.is_some_and(|checksum| checksum.value.eq_ignore_ascii_case(value))
     }
 
     /// Get checksum
diff --git a/src/models/package_information.rs b/src/models/package_information.rs
index a0cc561..bf8a2c2 100644
--- a/src/models/package_information.rs
+++ b/src/models/package_information.rs
@@ -307,12 +307,13 @@ pub enum ExternalPackageReferenceCategory {
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq, Copy)]
-#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+#[serde(rename_all = "SCREAMING-KEBAB-CASE")]
 pub enum PrimaryPackagePurpose {
     Application,
     Framework,
     Library,
     Container,
+    #[serde(alias = "OPERATING_SYSTEM")]
     OperatingSystem,
     Device,
     Firmware,
diff --git a/src/models/spdx_document.rs b/src/models/spdx_document.rs
index 69834e3..634e131 100644
--- a/src/models/spdx_document.rs
+++ b/src/models/spdx_document.rs
@@ -74,6 +74,7 @@ pub struct SPDX {
 
     /// Counter for creating SPDXRefs. Is not part of the spec, so don't serialize.
     #[serde(skip)]
+    #[allow(clippy::doc_markdown)]
     pub spdx_ref_counter: i32,
 }
 
diff --git a/src/parsers/mod.rs b/src/parsers/mod.rs
index 358492c..28c78cc 100644
--- a/src/parsers/mod.rs
+++ b/src/parsers/mod.rs
@@ -119,7 +119,7 @@ fn spdx_from_atoms(atoms: &[Atom]) -> Result<SPDX, SpdxError> {
             atom,
             &mut file_in_progress,
             &mut file_information,
-            &package_in_progress,
+            package_in_progress.as_ref(),
             &mut relationships,
         );
         process_atom_for_snippets(atom, &mut snippet_information, &mut snippet_in_progress);
@@ -411,7 +411,7 @@ fn process_atom_for_files(
     atom: &Atom,
     mut file_in_progress: &mut Option<FileInformation>,
     files: &mut Vec<FileInformation>,
-    package_in_progress: &Option<PackageInformation>,
+    package_in_progress: Option<&PackageInformation>,
     relationships: &mut HashSet<Relationship>,
 ) {
     match atom {
@@ -595,6 +595,7 @@ fn process_atom_for_relationships(
 }
 
 #[derive(Debug, Default)]
+#[allow(clippy::struct_field_names)]
 struct AnnotationInProgress {
     annotator_in_progress: Option<String>,
     date_in_progress: Option<DateTime<Utc>>,