Hi Vlado,
The w10:wrap element maps to the complex type CT_Wrap described in 19.3.2.6 wrap (Text Wrapping) in ISO 29500-4 (part 4). This is part of the VML (Vector Markup Language) support for WordprocessingML Drawing.
For the binary counterpart, this is described in MS-ODRAW 2.3.21.6 WrapText.
Best regards,
Tom Jebo
Microsoft Open Specifications Support