> 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/api/csharp/yarn.markup/yarn.markup.builtinmarkupreplacer/yarn.markup.builtinmarkupreplacer.processreplacementmarker.md).

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

Method in [BuiltInMarkupReplacer](/api/csharp/yarn.markup/yarn.markup.builtinmarkupreplacer.md)

## Summary

Produces replacement text for a marker.

```csharp
public List<LineParser.MarkupDiagnostic> ProcessReplacementMarker(MarkupAttribute marker, StringBuilder childBuilder, List<MarkupAttribute> childAttributes, string localeCode)
```

## Parameters

| Name                                                                                         | Description                                                                                                                                                               |
| -------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Yarn.Markup.MarkupAttribute](/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, if any.