/**
  <summary>Optional content [PDF:1.6:4.10], also known as layered content.</summary>
  <remarks>It refers to sections of content in a PDF document that can be selectively viewed or hidden
  by document authors or consumers. This capability is useful in items such as CAD drawings, layered
  artwork, maps, and multi-language documents.</remarks>
*/
namespace org.pdfclown.documents.contents.layers{}