This enumeration specifies how to include a resource in a file.
Values:
| IG_PDF_INCLUDE_ONCE_PER_DOC | Include the resource only once per file. |
| IG_PDF_INCLUDE_ON_EVERY_PAGE | Include the resource on every page in the file. |
| IG_PDF_INCLUDE_NEVER | Never include the resource. |
| IG_PDF_INCLUDE_WHEN_NEEDED | Include the resources only when needed. |
| IG_PDF_INCLUDE_BY_RANGE | Include the range of resource. |