Merge c6333f1 into d8677e6

src/main/resources/avro/bdg.avdl

@@ -1478,27 +1478,6 @@ record Slice { // extends Sequence
   map<string> attributes = {};
 }
 
-/**
- Quality score variant.
- */
-enum QualityScoreVariant {
-
-  /**
-   Sanger and Illumina version &gt;= 1.8 FASTQ quality score variant.
-   */
-  FASTQ_SANGER,
-
-  /**
-   Solexa and Illumina version 1.0 FASTQ quality score variant.
-   */
-  FASTQ_SOLEXA,
-
-  /**
-   Illumina version &gt;= 1.3 and &lt; 1.8 FASTQ quality score variant.
-   */
-  FASTQ_ILLUMINA
-}
-
 /**
  Sequence with quality scores.
  */
@@ -1530,15 +1509,11 @@ record Read { // extends Sequence
   union { null, long } length = null;
 
   /**
-   Quality scores for this read.
+   Quality scores for this read, in Sanger format, encoding
+   Phred quality scores from 0 to 93 using ASCII values 33 to 126.
    */
   union { null, string } qualityScores = null;
 
-  /**
-   Quality score variant for this read, defaults to QualityScoreVariant.FASTQ_SANGER.
-   */
-  union { QualityScoreVariant, null } qualityScoreVariant = "FASTQ_SANGER";
-
   /**
    Map of attributes.
    */