/// <summary>Harvest specific summary information from a <see cref="StructureDefinition"/> resource.</summary>
        /// <returns><c>true</c> if the current target represents a <see cref="StructureDefinition"/> resource, or <c>false</c> otherwise.</returns>
        /// <remarks>The <see cref="ArtifactSummaryGenerator"/> calls this method from a <see cref="ArtifactSummaryHarvester"/> delegate.</remarks>
        public static bool Harvest(IElementNavigator nav, ArtifactSummaryPropertyBag properties)
        {
            if (IsStructureDefinitionSummary(properties))
            {
                // [WMR 20171218] Harvest global core extensions, e.g. MaturityLevel
                nav.HarvestExtensions(properties, harvestExtension);

                // Explicit extractor chaining
                if (ConformanceSummaryProperties.Harvest(nav, properties))
                {
                    nav.HarvestValue(properties, FhirVersionKey, "fhirVersion");
                    nav.HarvestValue(properties, KindKey, "kind");
                    nav.HarvestValue(properties, ConstrainedTypeKey, "constrainedType");
                    nav.HarvestValue(properties, ContextTypeKey, "contextType");
                    nav.HarvestValue(properties, BaseKey, "base");
                }
                return(true);
            }
            return(false);
        }