IStructureddocumenttag.placeholder property. Gets the [BuildingBlock](../../../aspose.words/buildingblock/) containing placeholder text which should be displayed when this SDT run contents are empty, the associated mapped XML element is empty as specified via the [IStructureddocumenttag.xmlMapping](../xmlMapping/) element or the [IStructureddocumenttag.isShowingPlaceholderText](../isShowingPlaceholderText/) element is true.... StructuredDocumentTa ( doc , aw . Markup...base . artifactsDir + "StructuredDocumentTa.PlaceholderBuildingB...