code: private void parseStructuralVariationAttributes(String key, String value) {
          if (key == null || value == null) {
              return;
          }
          switch (key) {
              case SVINSSEQ_INFO:
                  // Seen DELETIONS with this field set. Makes no sense
                  if (VariantType.INSERTION.equals(type)) {
                      // SVINSSEQ contains the sequence inserted AFTER the reference.
                      // To represent correctly the alternate, given that reference, we need to add the reference as allele context
                      // If the variant is normalized, the alleles will be trimmed, removing this "context"
                      if (alternates.size() > 1) {
                          throw new IllegalArgumentException("Found SVINSSEQ in a multi allelic variant!");
                      } else {
                          setCall(start + ":" + reference + ":" + alternates.get(0) + ":" + 0);
                          setAlternate(reference + value);
                      }
                  }
                  break;
              case LEFT_SVINSSEQ_INFO:
                  // Seen DELETIONS with this field set. Makes no sense
                  if (VariantType.INSERTION.equals(type)) {
                      sv.setLeftSvInsSeq(value);
                  }
                  break;
              case RIGHT_SVINSSEQ_INFO:
                  // Seen DELETIONS with this field set. Makes no sense
                  if (VariantType.INSERTION.equals(type)) {
                      sv.setRightSvInsSeq(value);
                  }
                  break;
              case CIPOS_INFO:
                  String[] parts = value.split(",");
                  sv.setCiStartLeft(start + Integer.parseInt(parts[0]));
                  sv.setCiStartRight(start + Integer.parseInt(parts[1]));
                  break;
              case CIEND_INFO:
                  parts = value.split(",");
                  sv.setCiEndLeft(end + Integer.parseInt(parts[0]));
                  sv.setCiEndRight(end + Integer.parseInt(parts[1]));
                  break;
          }
  
      }
docs: Be aware! this method may change the main alternate
  @param key
  @param value