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Magnolia 5 UI field transformer classes no longer exist in the Magnolia 6 UI framework. The transformer functionality is now distributed among different components. The following is a summary of the features the components do:

• Modify the target property name by appending a locale suffix or by prepending a field prefix. This is done by concrete PropertySet implementations (JcrItemPropertySet) and/or by PropertyNameDecorator.
• Resolve an item data source of complex fields, a functionality usually covered by item providers.
• Manage item data sources of multi-value field entries. This is handled by MultiFormView.EntryResolution, which resolves the children and binds each of them to the item provider strategy.

Replacements for field transformers

Default 5 UI transformer classes

Other 5 UI transformer classes

info.magnolia.ui.form.field.transformer.*	In 6 UI
composite.DelegatingCompositeFieldTransformer	Use info.magnolia.ui.editor.CurrentItemProvider.
composite.NoOpCompositeTransformer	Not needed.
multi.DelegatingMultiValueFieldTransformer	Use info.magnolia.ui.editor.CurrentItemProvider.
multi.DelegatingMultiValueSubnodeTransformer  6.2.1+	Use info.magnolia.ui.editor.JcrChildNodeProvider and set supportI18N to false and propertyNameDecorator to info.magnolia.ui.field.AlwaysEmptyPrefixNameDecorator.
multi.MultiValueChildNodeTransformer	Deprecated, no automatic conversion.
multi.MultiValueChildrenNodeTransformer	Deprecated, no automatic conversion.
multi.MultiValueJSONTransformer	Deprecated, no automatic conversion.
multi.MultiValueSubChildrenNodePropertiesTransformer  6.2.1+	Use info.magnolia.ui.editor.JcrChildNodeProvider and set supportI18N to false and entryResolution to the now deprecated info.magnolia.ui.editor.ByLexicographicallyIndexedChildNodes.Definition.
multi.MultiValueSubChildrenNodeTransformer	Deprecated, no automatic conversion.

Personalization (trait) transformers

The 5 UI transformers with personalization-related functions have undergone the following changes, but still use the old framework (magnolia-personalization-compatibility).