feat: Allow specific versions of formats to be specified (#1543)

syft/formats/spdxjson/format.go

@@ -4,14 +4,30 @@ import (
 	"github.com/anchore/syft/syft/sbom"
 )
 
-const ID sbom.FormatID = "spdx-2-json"
+const ID sbom.FormatID = "spdx-json"
+
+var IDs = []sbom.FormatID{ID}
 
 // note: this format is LOSSY relative to the syftjson format
-func Format() sbom.Format {
+
+func Format2_2() sbom.Format {
 	return sbom.NewFormat(
-		ID,
-		encoder,
+		"2.2",
+		encoder2_2,
 		decoder,
 		validator,
+		IDs...,
 	)
 }
+
+func Format2_3() sbom.Format {
+	return sbom.NewFormat(
+		"2.3",
+		encoder2_3,
+		decoder,
+		validator,
+		IDs...,
+	)
+}
+
+var Format = Format2_3