/// <summary>
/// Add the paragraph id feature if not already registered.
/// </summary>
/// <param name="doc">Document to add feature to.</param>
/// <param name="options">Options of how paragraph ids should be generated.</param>
public static void AddParagraphIdFeature(this WordprocessingDocument doc, ParagraphIdOptions?options = default)
{
options ??= new();
doc.AddParagraphIdGeneratorFeature();
if (doc.Features.Get <IParagraphIdCollectionFeature>() is null)
{
doc.AddPartEventsFeature();
doc.AddElementEventFeature();
var feature = new WordDocumentParagraphIdCollectionFeature(
doc,
options,
doc.Features.GetRequired <IPartEventsFeature>(),
doc.Features.GetRequired <IElementEventFeature>());
doc.Features.SetDisposable <IParagraphIdCollectionFeature>(feature);
feature.Initialize();
}
}