Descriptions are taken from the HolderTypes class.
| Namespace | Description |
| http://www.baka.sk/xml/gene/holder/jpeg | Denotes a JPG image format transmitted as a Stream. |
| http://www.baka.sk/xml/gene/holder/png | Denotes a PNG image format transmitted as a Stream. |
| http://www.baka.sk/xml/gene/holder/gif | Denotes a GIF image format transmitted as a Stream. |
| http://www.baka.sk/xml/gene/holder/latex | Denotes a LaTeX file transmitted as a Stream, in UTF-8 encoding. |
| http://www.baka.sk/xml/gene/holder/eps | Denotes an EPS file transmitted as a Stream, in UTF-8 encoding. |
| http://www.baka.sk/xml/gene/holder/image | Denotes a object holder that holds Graphics object - ImageRef instance. If the consumer wants to provide specific instances of images then it may do so by offering instance of ImageRefFactory object. |