task.getVersion().convention(project.provider(() -> project.getVersion().toString()));
            task.getSourceFile().convention(dslDocbook.flatMap(AssembleDslDocTask::getDestFile));
            task.getLinksFile().convention(dslDocbook.flatMap(AssembleDslDocTask::getLinksFile));

            task.getDsldocUrl().convention("../dsl");
            task.getJavadocUrl().convention("../javadoc");

            task.getInputEncoding().convention(Charset.defaultCharset().name());
            task.getOutputEncoding().convention(Charset.defaultCharset().name());

            task.getMarkdownFile().convention(extension.getReleaseNotes().getMarkdownFile());
            task.getDestinationFile().convention(extension.getStagingRoot().file("release-notes/raw.html"));
        });

When defining conventions for a property, there are largely three approaches:
1. Do not set a convention at all
2. Set a convention in a plugin
3. Set a convention in a constructor

Most properties should have a convention set, so (1) can be treated as a rare case where a value must be provided by a user.

            userManual.getRoot().convention(extension.getSourceRoot().dir("userguide"));
            userManual.getStagingRoot().convention(extension.getStagingRoot().dir("usermanual"));
            // TODO: These should be generated too
            userManual.getSnippets().convention(layout.getProjectDirectory().dir("src/snippets"));
            userManual.getSamples().convention(layout.getProjectDirectory().dir("src/samples"));

    }
  },

  /** Java variable naming convention, e.g., "lowerCamel". */
  LOWER_CAMEL(CharMatcher.inRange('A', 'Z'), "") {
    @Override
    String normalizeWord(String word) {
      return firstCharOnlyToUpper(word);
    }

    @Override
    String normalizeFirstWord(String word) {
      return Ascii.toLowerCase(word);
    }
  },

  /** Java and C++ class naming convention, e.g., "UpperCamel". */

    val isSnapshot = !finalRelease.isPresent && !rcNumber.isPresent && !milestoneNumber.isPresent

    moduleIdentity.version.convention(GradleVersion.version(versionNumber))
    moduleIdentity.snapshot.convention(isSnapshot)
    moduleIdentity.buildTimestamp.convention(buildTimestamp)
    moduleIdentity.promotionBuild.convention(isPromotionBuild)

    moduleIdentity.releasedVersions = provider {
        ReleasedVersionsDetails(

    }
  },

  /** Java variable naming convention, e.g., "lowerCamel". */
  LOWER_CAMEL(CharMatcher.inRange('A', 'Z'), "") {
    @Override
    String normalizeWord(String word) {
      return firstCharOnlyToUpper(word);
    }

    @Override
    String normalizeFirstWord(String word) {
      return Ascii.toLowerCase(word);
    }
  },

  /** Java and C++ class naming convention, e.g., "UpperCamel". */

    public JapicmpTask() {
        getFailOnModification().convention(false);
        getFailOnSourceIncompatibility().convention(false);
        getIgnoreMissingClasses().convention(false);
        getIncludeSynthetic().convention(false);
        getOnlyBinaryIncompatibleModified().convention(false);
        getOnlyModified().convention(false);
        getAccessModifier().convention("public");

            task.into(extension.getDocumentationRenderedRoot());
        });

        extension.getSourceRoot().convention(layout.getProjectDirectory().dir("src/docs"));
        extension.getDocumentationRenderedRoot().convention(layout.getBuildDirectory().dir("docs"));
        extension.getStagingRoot().convention(layout.getBuildDirectory().dir("working"));

        ConfigurableFileTree css = objects.fileTree();

    @get:Input
    abstract val excludes: ListProperty<String>

    @get:Input
    abstract val includes: ListProperty<String>

    init {
        excludes.convention(DEFAULT_EXCLUDES)
        includes.convention(DEFAULT_INCLUDES)
    }

    @TaskAction
    fun generate() {
        IoActions.writeTextFile(outputFile.asFile.get(), object : ErroringAction<BufferedWriter>() {