Starting to play with those. So just FYE, here is what I wrote yesterday:

// create the new document.xml package part

Uri documentUri = new Uri("/word/document.xml", UriKind.Relative);

PackagePart documentPart = package.CreatePart(documentUri, "application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml");

 

XNamespace r = "http://schemas.openxmlformats.org/officeDocument/2006/relationships";

XNamespace wp = "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing";

XNamespace w = "http://schemas.openxmlformats.org/wordprocessingml/2006/main";

XNamespace dm = "http://schemas.openxmlformats.org/drawingml/2006/main";

XNamespace dp = "http://schemas.openxmlformats.org/drawingml/2006/picture";

 

var firstParagraph = new XElement(w.GetName("p"),

                                  new XElement(w.GetName("r"),

                                               new XElement(w.GetName("t"), "A paragraph")));

 

var secondParagraph = new XElement(w.GetName("p"),

                                   new XElement(w.GetName("r"),

                                                new XElement(w.GetName("t"),

                                                             new XAttribute(XNamespace.Xml + "space", "preserve"),

                                                             "A ")),

                                   new XElement(w.GetName("hyperlink"),

                                                new XAttribute(r.GetName("id"), "rId2"),

                                                new XElement(w.GetName("r"),

                                                             new XElement(w.GetName("rPr"),

                                                                          new XElement(w.GetName("color"),

                                                                                       new XAttribute(w.GetName("val"), "0000FF"),

                                                                                       new XAttribute(w.GetName("themeColor"), "hyperlink")),

                                                                          new XElement(w.GetName("u"),

                                                                                       new XAttribute(w.GetName("val"), "single"))),

                                                             new XElement(w.GetName("t"), "hyperlink"))));

 

var graphic = new XElement(dm.GetName("graphic"),

                           new XAttribute(XNamespace.Xmlns + "dm", dm.NamespaceName),

                           new XElement(dm.GetName("graphicData"),

                                        new XAttribute("uri", dp.NamespaceName),

                                        new XElement(dp.GetName("pic"),

                                        new XAttribute(XNamespace.Xmlns + "dp", dp.NamespaceName),

                                        new XElement(dp.GetName("nvPicPr"),

                                                     new XElement(dp.GetName("cNvPr"),

                                                                  new XAttribute("id", 0),

                                                                  new XAttribute("name", "openxmldeveloper.gif")),

                                                     new XElement(dp.GetName("cNvPicPr"))),

                                        new XElement(dp.GetName("blipFill"),

                                                     new XElement(dm.GetName("blip"),

                                                                  new XAttribute(r.GetName("embed"), "rId1")),

                                                     new XElement(dm.GetName("stretch"),

                                                                  new XElement(dm.GetName("fillRect")))),

                                        new XElement(dp.GetName("spPr"),

                                                     new XElement(dm.GetName("xfrm"),

                                                                  new XElement(dm.GetName("off"),

                                                                               new XAttribute("x", 0),

                                                                               new XAttribute("y", 0)),

                                                                  new XElement(dm.GetName("ext"),

                                                                               new XAttribute("cx", 4448175),

                                                                               new XAttribute("cy", 1181100))),

                                                     new XElement(dm.GetName("prstGeom"),

                                                                  new XAttribute("prst", "rect"),

                                                                  new XElement(dm.GetName("avLst")))))));

 

var drawing = new XElement(w.GetName("drawing"),

                           new XElement(wp.GetName("inline"),

                                        new XElement(wp.GetName("extent"),

                                                     new XAttribute("cx", 4448175),

                                                     new XAttribute("cy", 1181100)),

                                        new XElement(wp.GetName("docPr"),

                                                     new XAttribute("id", 1),

                                                     new XAttribute("name", "Picture 0"),

                                                     new XAttribute("descr", "openxmldeveloper.gif")),

                                        new XElement(wp.GetName("cNvGraphicFramePr"),

                                                     new XElement(dm.GetName("graphicFrameLocks"),

                                                                  new XAttribute(XNamespace.Xmlns + "dm", dm.NamespaceName),

                                                                  new XAttribute("noChangeAspect", 1))),

                                        graphic));

 

var thirdParagraph = new XElement(w.GetName("p"),new XElement(w.GetName("r"),drawing));

 

var document = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"),

                              new XElement(w.GetName("document"),

                                           new XAttribute(XNamespace.Xmlns + "r", r.NamespaceName),

                                           new XAttribute(XNamespace.Xmlns + "wp", wp.NamespaceName),

                                           new XAttribute(XNamespace.Xmlns + "w", w.NamespaceName),

                                           new XElement(w.GetName("body"), firstParagraph, secondParagraph, thirdParagraph)));

 

using (XmlWriter xmlWriter = XmlWriter.Create(documentPart.GetStream()))

   document.WriteTo(xmlWriter);