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The dtd file is very old and doesn't match gtk+.xml from glade gtk plugin. Update it so that the future additions pass verification. --- Add add-child-verify-function, add-child-function, remove-child-function, replace-child-function, child-action-activate-function, get-property-function, verify-function, special-child-type and packing-actions to glade-widget-class element definition. Additionally define add-child-verify-function, child-action-activate-function, get-property-function, special-child-type, and packing-actions elements. For packing-action, define action element and attributes. Define and add displayable-values to property definition. Remove parameter-spec's duplicate "paremter-spec" and add min child, along with its definition.
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