Replacing LinkInline with reference form - how?

Trying to find documentation and I get the idea I am either not finding it - but neither is my AI.

I need to import a markdown document (thousands actually) and extract all the links so they can be maintained separately.

I found them using

    foreach (var node in document.Descendants())
    {
        if (node is LinkInline link)
        {
            var url = link.Url;
            //var linkText = link.FirstChild.ToString();

probem is- what do I replace them with if I then add the references? I have the key - i Just have no idea what to put there.

It seems nto toto be a LinkReferenceDefinition - that is for the references. SO what do I replace it with? The LinkReferenceDefinition can not be it, or?

Start by reading the LinkInline and LinkReferenceDefinition types mentioned in the issue, then trace how reference links are represented when parsing a Markdown document. Done means documenting which node replaces an extracted LinkInline and how its key connects to a reference definition.