revision.matches(moduleId.getVersion());

        field(publication, "branch", metadata.getBranch())
                .optionalNotEmpty()
                .doesNotContainSpecialCharacters(true);

        field(publication, "status", metadata.getStatus())
                .optionalNotEmpty()
                .validInFileName();
    }

            }
            offset += Character.charCount(unicodeChar);
        }
        return type.cast(this);
    }

    public T optionalNotEmpty() {
        if (value != null && value.length() == 0) {
            throw failure(String.format("%s cannot be an empty string. Use null instead.", name));
        }
        return type.cast(this);
    }

                    .notNull()
                    .validInFileName();
            field(publication, "artifact classifier", artifact.getClassifier())
                    .optionalNotEmpty()
                    .validInFileName();

            checkCanPublish(publication.getName(), artifact);
        }
    }