Here is a list of all struct and union fields with links to the structures/unions they belong to:

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• OBJECT : Zend_Validate_NotEmpty
• OBJECT_COUNT : Zend_Validate_NotEmpty
• OBJECT_STRING : Zend_Validate_NotEmpty
• OBJECT_TYPE_ORDER : SalesEventInterface
• objectToXml() : Xml
• objectWithCustomAttributesMethod() : TestService
• OBOL : Zend_Measure_Weight
• OBOLOS : Zend_Measure_Weight
• OBOLOS_ANCIENT : Zend_Measure_Weight
• OBOLUS : Zend_Measure_Weight
• OBOLUS_ANCIENT : Zend_Measure_Weight
• OBSERVER_INTERFACE : ObserverImplementationTest
• observerNameProvider() : CollectionTest
• OCTAL : Zend_Measure_Number
• OFFLINE_INVOICE_MESSAGE : AssertOnlineInvoiceCannotBeCreated
• offsetExists() : ProductLimitation , Collection , DataObject , Iterator , TMap , Pool , Zend_Db_Table_Row_Abstract , Zend_Db_Table_Rowset_Abstract , Zend_Mail_Storage_Abstract , Zend_Memory_Value , Zend_Pdf_NameTree , Zend_Registry
• offsetGet() : ProductLimitation , Collection , DataObject , Iterator , TMap , Pool , Zend_Db_Table_Row_Abstract , Zend_Db_Table_Rowset_Abstract , Zend_Mail_Storage_Abstract , Zend_Memory_Value , Zend_Pdf_NameTree
• offsetPath() : FileSystem
• offsetPathDataProvider() : FileSystemTest
• offsetSet() : ProductLimitation , Collection , DataObject , Iterator , TMap , Pool , Zend_Db_Table_Row_Abstract , Zend_Db_Table_Rowset_Abstract , Zend_Mail_Storage_Abstract , Zend_Memory_Value , Zend_Pdf_NameTree
• offsetUnset() : ProductLimitation , Collection , DataObject , Iterator , TMap , Pool , Zend_Db_Table_Row_Abstract , Zend_Db_Table_Rowset_Abstract , Zend_Mail_Storage_Abstract , Zend_Memory_Value , Zend_Pdf_NameTree
• OKA : Zend_Measure_Weight
• OLD_ASSERTION_ATTRIBUTES : ActionObject
• OLD_TABLE_SUFFIX : Full
• oldSchemaUpgradeDataProvider() : DiffOldSchemaTest
• ON_DELETE : Zend_Db_Table_Abstract
• ON_UPDATE : Zend_Db_Table_Abstract
• ONCA : Zend_Measure_Weight
• ONCE : RowBaseAndTotalBaseCalculatorTestCase , Zend_Measure_Weight
• ONCIA : Zend_Measure_Weight
• onCommandEvent() : Plugin
• ONE_PER_SECOND : Zend_Measure_Frequency
• onNewCodeEvent() : Plugin
• onPackageChange() : Plugin
• onPackageUnistall() : Plugin
• ONS : Zend_Measure_Weight
• ONZA : Zend_Measure_Weight
• OP_ADD : Zend_Acl
• OP_REMOVE : Zend_Acl
• open() : ProductItem , CatalogCategory , CatalogCategoryEdit , File , BackupInterface , Http , Https , Read , AbstractIo , File , Ftp , IoInterface , Sftp , AbstractAdapter , AdapterInterface , Gd2 , ImageMagick , Image , DbTable , SaveHandler , Redis , BackendPage , SwaggerUiPage , Zend_Session_SaveHandler_DbTable , Zend_Session_SaveHandler_Interface
• OPEN_PARENTHESIS : TokenizerSymbolsInterface
• OPEN_TAG_KEY : Sitemap
• openAdditionalSettings() : Form
• openAdvancedSearch() : Footer
• openCategory() : AssertCategoryBreadcrumbs , AbstractAssertTaxRuleIsAppliedToAllPrices , AbstractAssertTaxWithCrossBorderApplying
• openChangeEmail() : Info
• openChangePassword() : Info
• openContainer() : FormTabs , AbstractFormContainers , FormSections
• openCustomerAddress() : Addresses
• openCustomerCreateLink() : Links
• openCustomSection() : ProductForm
• openDataProvider() : InterfaceTest
• openDownloadableLink() : DownloadProductsReportEntityTest
• openEditContactInfo() : Info
• openEstimateShippingAndTax() : Shipping
• openFile() : DeployStaticFile , Read , ReadInterface , Write , WriteInterface
• openFileProvider() : WriteTest
• openFilterBlock() : DataGrid
• openFirstRow() : Grid
• openLink() : ListProducts , Links
• openLinkByName() : View
• openMapBlock() : ProductItem , View
• openMenuItem() : Links
• openMiniCart() : Sidebar
• openNewCategoryDialog() : NewCategoryIds
• openNewTabGoToVerify() : AdminStep
• openOrder() : Success
• openOrderById() : History
• openOutlinesCount() : Zend_Pdf_Outline
• openProducts() : ViewedProductsReportEntityTest
• openReview() : Grid
• openRoleTab() : Form
• openSearchMenu() : Menu
• openSection() : ProductForm , NewConfigurableAttributeForm , FormSections
• openStream() : State
• openTab() : FormTabs , AttributeForm , PageForm , CustomerForm
• openTrackingPopup() : ShippingInfoBlock
• openTransaction() : TransactionsGrid
• OPERATION_COUNT : BulkSummaryInterface
• OPERATION_NAME : AddColumn , AddComplexElement , CreateTable , DropElement , DropReference , DropTable , ModifyColumn , ModifyTable , ReCreateTable , GeneratorTest
• OPERATION_NOT_SUPPORTED : Zend_Pdf_Resource_Font_Extracted
• OPERATION_OBJECT_ARRAY : OperationElementExtractor
• OPERATION_OBJECT_ARRAY_VALUE : OperationElementExtractor
• OPERATION_OBJECT_DATA_TYPE : OperationElementExtractor
• OPERATION_OBJECT_ENTRY : OperationElementExtractor
• OPERATION_OBJECT_KEY : OperationElementExtractor
• OPERATION_OBJECT_OBJ_NAME : OperationElementExtractor
• OPERATIONS_LIST : BulkOperationsStatusInterface , DetailedBulkOperationsStatusInterface
• operationStatusToBulkSummaryStatus() : StatusMapper
• OPERATOR : ConditionInterface
• OPTION_AREACODE : StartConsumerCommand
• OPTION_BATCH_SIZE : StartConsumerCommand
• OPTION_BY_EMAIL : ResetMethod
• OPTION_BY_IP : ResetMethod
• OPTION_BY_IP_AND_EMAIL : ResetMethod
• OPTION_CODE : DownloadCustomOptionTest
• OPTION_DEFAULT : Table
• OPTION_GROUP_DATE : ProductCustomOptionInterface
• OPTION_GROUP_FILE : ProductCustomOptionInterface
• OPTION_GROUP_SELECT : ProductCustomOptionInterface
• OPTION_GROUP_TEXT : ProductCustomOptionInterface
• OPTION_ID : BundleOption , CustomOptionInterface , ConfigurableItemOptionValueInterface , DownloadCustomOptionTest , EavAttributeTest
• OPTION_IDENTITY : Table
• OPTION_LENGTH : Table
• OPTION_LOCK : ConfigSetCommand
• OPTION_LOCK_CONFIG : ConfigSetCommand
• OPTION_LOCK_ENV : ConfigSetCommand
• OPTION_NO_UPDATE : SampleDataDeployCommand , SampleDataRemoveCommand
• OPTION_NONE : ResetMethod
• OPTION_NULLABLE : Table
• OPTION_NUMBER_OF_MESSAGES : StartConsumerCommand
• OPTION_PRECISION : Table
• OPTION_PREFIX : AbstractType
• OPTION_PRIMARY : Table
• OPTION_PRODUCT_ID : DownloadCustomOptionTest
• OPTION_QTY : BundleOption
• OPTION_SCALE : Table
• OPTION_SCOPE : ConfigSetCommand
• OPTION_SCOPE_CODE : ConfigSetCommand
• OPTION_SELECTIONS : BundleOption
• OPTION_TYPE : Table , DownloadCustomOptionTest
• OPTION_TYPE_AREA : ProductCustomOptionInterface
• OPTION_TYPE_CHECKBOX : ProductCustomOptionInterface
• OPTION_TYPE_DATE : ProductCustomOptionInterface
• OPTION_TYPE_DATE_TIME : ProductCustomOptionInterface
• OPTION_TYPE_DROP_DOWN : ProductCustomOptionInterface
• OPTION_TYPE_FIELD : ProductCustomOptionInterface
• OPTION_TYPE_FILE : ProductCustomOptionInterface
• OPTION_TYPE_MULTIPLE : ProductCustomOptionInterface
• OPTION_TYPE_RADIO : ProductCustomOptionInterface
• OPTION_TYPE_TIME : ProductCustomOptionInterface
• OPTION_UNSIGNED : Table
• OPTION_USE_OWN_IMAGE : Thumbnail
• OPTION_USE_PARENT_IMAGE : Thumbnail
• OPTION_VALUE : CustomOptionInterface , ConfigurableItemOptionValueInterface , DownloadCustomOptionTest
• OPTIONAL : ArgumentSequence
• OPTIONAL_ZIP_COUNTRIES_CONFIG_PATH : Data
• optionalArgsDataProvider() : CsvTest
• optionDataProvider() : ProductCustomOptionRepositoryTest
• optionHtmlProvider() : ItemTest
• optionNameConvert() : Bundle , Options , Curl
• optionNegativeDataProvider() : ProductCustomOptionRepositoryTest
• optionNegativeUpdateDataProvider() : ProductCustomOptionRepositoryTest
• optionRowToCellString() : Product
• OPTIONS : VaultDataBuilder , AttributeMetadataInterface , OptionInterface , AttributeInterface , Zend_Http_Client , Zend_Oauth
• OPTIONS_RESULT : DataProviderTest
• optionsProvider() : ConfigTest
• optionsWithBackendModelDataProvider() : AttributeOptionProviderTest
• optionValuesData() : CombineTest
• OR : Operator
• order() : AbstractMethod , Adapter , MethodInterface , Express , Processor , NullPaymentProvider , Vault , Zend_Db_Select
• ORDER : Zend_Db_Select
• ORDER_BIG_CONFIGURABLE_PRODUCT_COUNT_FROM : OrdersFixture
• ORDER_BIG_CONFIGURABLE_PRODUCT_COUNT_TO : OrdersFixture
• ORDER_CONFIGURABLE_PRODUCT_COUNT_FROM : OrdersFixture
• ORDER_CONFIGURABLE_PRODUCT_COUNT_TO : OrdersFixture
• ORDER_CURRENCY_CODE : CreditmemoInterface , InvoiceInterface , OrderInterface
• ORDER_ENTITY_TYPE_ID : SalesSetup
• ORDER_FIELD : Tree , Db , Dbp
• ORDER_ID : PaymentDataBuilder , CreditmemoInterface , InvoiceInterface , OrderItemInterface , ShipmentInterface , ShipmentTrackInterface , TransactionInterface , TokensConfigProviderTest
• ORDER_INCREMENT_ID : OrderItemRepositoryTest , OrderCreateTest , OrderGetStatusTest , OrderGetTest , OrderItemGetListTest , OrderItemGetTest , OrderStatusHistoryAddTest , PaymentTokenTest
• ORDER_ITEM_ID : CreditmemoItemInterface , InvoiceItemInterface , ShipmentItemInterface , OrderSaveTest
• ORDER_ITEM_ID_PLACEHOLDER : CreditmemoFactoryTest
• ORDER_ITEMS : Config
• ORDER_LIMIT : Recent
• ORDER_PARAM_NAME : Toolbar
• ORDER_PAYMENT_ENTITY_ID : TokensConfigProviderTest
• ORDER_PLACED : Config
• ORDER_SIMPLE_PRODUCT_COUNT_FROM : OrdersFixture
• ORDER_SIMPLE_PRODUCT_COUNT_TO : OrdersFixture
• ORDER_STATUS : UpdateOrderStatusForPaymentMethodsObserverTest
• ORDER_STATUS_CANCELED_REVERSAL : Info
• ORDER_STATUS_REVERSED : Info
• ORDER_USER_DEFINED_ATTRIBUTE_VALUE : InfoTest
• ORDER_VALUE : Config
• orderByCreatedAt() : Collection
• orderByCustomerRegistration() : Collection
• orderByLabel() : Collection
• orderByOrdersCount() : Collection
• orderByPosition() : Collection
• orderByTotalAmount() : Collection
• orderCountryOptions() : AttributeMerger
• orderCreditMemo() : Actions
• orderDataProvider() : ViewTest
• orderId() : BraintreeSearchAdapter
• ORDERID : OrderSaveTest
• orderInvoiceCreditMemo() : Actions
• orderParamsDataProvider() : CreatedatTest
• orderRand() : AdapterInterface , Mysql , Select
• organizeData() : Set
• orHaving() : Zend_Db_Select
• ORIG_CUSTOMER_ID : AddressTest
• ORIG_PARENT_ID : AddressTest
• ORIGINAL_INCREMENT_ID : OrderInterface
• ORIGINAL_PRICE : OrderItemInterface
• orWhere() : Zend_Db_Select
• OTHER_CHECKS_WILL_FAIL_MSG : CronScriptReadinessCheck
• otherException() : Error , ErrorInterface
• OUNCE : Zend_Measure_Cooking_Volume , Zend_Measure_Cooking_Weight , Zend_Measure_Volume , Zend_Measure_Weight
• OUNCE_FOOT : Zend_Measure_Torque
• OUNCE_FORCE : Zend_Measure_Force , Zend_Measure_Weight
• OUNCE_INCH : Zend_Measure_Torque
• OUNCE_PER_CUBIC_FOOT : Zend_Measure_Density
• OUNCE_PER_CUBIC_INCH : Zend_Measure_Density
• OUNCE_PER_CUBIC_INCH_TROY : Zend_Measure_Density
• OUNCE_PER_CUBIC_YARD : Zend_Measure_Density
• OUNCE_PER_CUBIC_YARD_TROY : Zend_Measure_Density
• OUNCE_PER_DAY : Zend_Measure_Flow_Mass , Zend_Measure_Flow_Volume
• OUNCE_PER_GALLON : Zend_Measure_Density
• OUNCE_PER_GALLON_TROY : Zend_Measure_Density
• OUNCE_PER_GALLON_US : Zend_Measure_Density
• OUNCE_PER_GALLON_US_TROY : Zend_Measure_Density
• OUNCE_PER_HOUR : Zend_Measure_Flow_Mass , Zend_Measure_Flow_Volume
• OUNCE_PER_MINUTE : Zend_Measure_Flow_Mass , Zend_Measure_Flow_Volume
• OUNCE_PER_SECOND : Zend_Measure_Flow_Mass , Zend_Measure_Flow_Volume
• OUNCE_PER_SQUARE_INCH : Zend_Measure_Pressure
• OUNCE_TROY : Zend_Measure_Weight
• OUNCE_US : Zend_Measure_Cooking_Volume , Zend_Measure_Volume
• OUNCE_US_PER_DAY : Zend_Measure_Flow_Volume
• OUNCE_US_PER_HOUR : Zend_Measure_Flow_Volume
• OUNCE_US_PER_MINUTE : Zend_Measure_Flow_Volume
• OUNCE_US_PER_SECOND : Zend_Measure_Flow_Volume
• OUNCES_POUND : Carrier
• OUNCR_PER_CUBIC_FOOT_TROY : Zend_Measure_Density
• output() : Download
• OUTPUT_DIR : MetadataGenUtil , MetadataGenerator
• OUTPUT_DIR2 : MetadataGenerator
• OUTPUT_FIELD_PARAMETER : TypeMetaWrapperReader
• OUTPUT_FILE_OPTION : GenerateVclCommand
• OUTPUT_FORMAT_ARRAY : ElementFactory , AttributeDataFactory
• OUTPUT_FORMAT_HTML : ElementFactory , AttributeDataFactory
• OUTPUT_FORMAT_JSON : ElementFactory , AttributeDataFactory
• OUTPUT_FORMAT_ONELINE : ElementFactory , AttributeDataFactory
• OUTPUT_FORMAT_PDF : ElementFactory , AttributeDataFactory
• OUTPUT_FORMAT_TEXT : ElementFactory , AttributeDataFactory
• outputData() : Form
• outputDataProvider() : BackupTest
• outputFilter() : Date , Escapehtml , FilterInterface , Striptags , Trim
• outputValue() : Postcode , AbstractData , Date , File , Multiline , Multiselect , Postcode , Select , Text , ExtendsAbstractData , AbstractData , Date , File , Multiline , Multiselect , Select , Text
• outputValueDataProvider() : FileTest , SelectTest , DateTest , FileTest , MultilineTest , MultiselectTest , SelectTest
• outputValueJsonDataProvider() : MultiselectTest
• outputValueTextDataProvider() : MultiselectTest
• overloadDataProvider() : DependencyDecoratorTest
• overriddenUrlKeyForStoreDataProvider() : StoreViewServiceTest
• override() : Resolver , ParamsOverrider
• OVERRIDE_LIFETIME : Zend_Session_SaveHandler_DbTable
• overrideAttribute() : AbstractType
• overrideBaseFilesDataProvider() : LayoutTest
• overrideMethod() : ProductTest
• overrideParamsDataProvider() : ParamsOverriderTest
• overridePath() : Filesystem
• overrideProductUrl() : Renderer
• overrideRequestBodyIdWithPathParam() : Request , ParamsOverrider
• overrideThemeFilesDataProvider() : LayoutTest
• overrideValue() : ArgumentObject
• OVERWRITE_OPTION : XmlConverterCommand
• OXGANG : Zend_Measure_Area