> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/3.1/api/csharp/yarn.markup/yarn.markup.iattributemarkerprocessor/yarn.markup.iattributemarkerprocessor.processreplacementmarker.md).

# ProcessReplacementMarker(MarkupAttribute,System.Text.StringBuilder,List\<MarkupAttribute>,string)

Method in [IAttributeMarkerProcessor](/3.1/api/csharp/yarn.markup/yarn.markup.iattributemarkerprocessor.md)

## Summary

Produces replacement text for a marker.

```csharp
public ReplacementMarkerResult ProcessReplacementMarker(MarkupAttribute marker, System.Text.StringBuilder childBuilder, List<MarkupAttribute> childAttributes, string localeCode);
```

## Parameters

| Name                                                                                             | Description                                                                                                                                                               |
| ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Yarn.Markup.MarkupAttribute](/3.1/api/csharp/yarn.markup/yarn.markup.markupattribute.md) marker | The marker to process into replacement text.                                                                                                                              |
| `System.Text.StringBuilder` childBuilder                                                         | A `System.Text.StringBuilder` that contains the child text contained within `marker` . Use the methods on this stringbuilder to produce any text needed from this marker. |
| `System.Collections.Generic.List<Yarn.Markup.MarkupAttribute>` childAttributes                   | The child attributes of `marker` .                                                                                                                                        |
| `string` localeCode                                                                              | A BCP-47 locale code that represents the locale in which any processing should take place.                                                                                |

## Returns

The collection of diagnostics produced during processing, and the number of invisible characters created during processing.