/**
     * Define a variant with attributes. Variants are only published when using {@link #withModuleMetadata()}.
     */
    MavenModule variant(String variant, Map<String, String> attributes)

    /**
     * Define a variant with attributes. Variants are only published when using {@link #withModuleMetadata()}.
     */

    private final DomainObjectSet<SoftwareComponent> variants;

    public MainExecutableVariant(ObjectFactory objectFactory) {
        variants = objectFactory.domainObjectSet(SoftwareComponent.class);
    }

    @Override
    public String getName() {
        return "main";
    }

    @Override
    public Set<SoftwareComponent> getVariants() {
        return variants;
    }

        long instanceId = decoder.readSmallLong();
        VariantGraphResolveState variant = variants.get(instanceId);
        if (variant == null) {
            throw new IllegalStateException("No variant with id " + instanceId + " found.");
        }
        return variant;
    }

import java.util.List;
import java.util.Set;

/**
 * Immutable metadata for a component variant instance that is used to perform dependency graph resolution.
 *
 * <p>Note that this metadata does not provide any information about the available artifacts of this variants, as this may be expensive to resolve.
 * Information about the artifacts can be accessed via the methods of {@link ComponentGraphResolveState}.</p>

cpp-application-variant-task-graph.png...

        }
        with(javaLibrary.parsedModuleMetadata) {
            assert variants.size() == 1
            assert variants[0].name == "apiElements"
            assert variants[0].dependencies*.coords == ["org:foo:1.0"]
        }
    }

    def "can ignore all publication warnings by variant name"() {
        given:
        def silenceMethod = "suppressPomMetadataWarningsFor"

        The only attribute distinguishing these variants is 'org.gradle.native.architecture'. Add this attribute to the consumer's configuration to resolve the ambiguity:
          - Value: 'x86-64' selects variant: 'natives-windows-runtime'

swift-application-variant-task-graph.png...

    def "expressing a preference for a variant with capabilities declared in a published modules does not evict unrelated variants"() {
        given:
        repository {
            'org:testB:1.0' {
                variant('runtime') {
                    capability('org', 'testB', '1.0')
                }
                variant('runtimeAlt') {
                    capability('org', 'testB', '1.0')

        then: "attributes are used during matching, the rule is applied on all variants"
        2 * attributesRule.execute(_)

        and: " we only apply the dependencies rule to the selected variant"
        1 * dependenciesRule.execute(_)
        1 * constraintsRule.execute(_)
        0 * _
    }

    def "treats ivy configurations as variants"() {
        given:
        def rule = Mock(Action)

        when: