Linq to xml. Determine the end of the tag

I have a piece of xml like the following:

<side>
 <category>
   <title>Head</head>
   <item> Mister a </item>
 </category>
 <category>
   <title>Head</head>
   <item> Mister x </item>
   <item> Mister y </item>
 </category>
</side>

I am recovering for each category title and item and once arrived at the end of the category, place a separator that allows to separate categories. For now I can recover well for each category title and item, but I can not place a separator between two categories

this is my code in C# :

foreach (XElement node in doc.Descendants("category").Elements())
        {

                if (node.Name.LocalName.Equals("titre"))
                {
                    layout.Records.Add(new XMLRecord()
                    {
                        Type = "Titre",
                        Contenu = node.Value
                    });

                }
                else if (node.Name.LocalName.Equals("item"))
                {
                    layout.Records.Add(new XMLRecord()
                    {
                        Type = "Item",
                        Contenu = node.Value
                    });

                }
                else if (node.Name.LocalName.Equals("item") && node.NextNode == null)
                {
                    layout.Records.Add(new XMLRecord()
                    {
                        Type = "Item",
                        Contenu = node.Value
                    });

                    layout.Records.Add(new XMLRecord()
                    {
                        Type = "Separateur",
                        Contenu = ""
                    });


                }




        }
        return layout.Records;