| Value | Meaning |
|---|---|
| INVALID0 | used to terminate the list of attributes to collect |
| STRING1 | collect the string pointer directly from the attribute_values[] array. Expects a parameter of type (const char **). If G_MARKUP_COLLECT_OPTIONAL is specified and the attribute isn't present then the pointer will be set to NULL |
| STRDUP2 | as with G_MARKUP_COLLECT_STRING, but expects a parameter of type (char **) and g_strdup()s the returned pointer. The pointer must be freed with g_free() |
| BOOLEAN3 | expects a parameter of type (gboolean *) and parses the attribute value as a boolean. Sets FALSE if the attribute isn't present. Valid boolean values consist of (case-insensitive) "false", "f", "no", "n", "0" and "true", "t", "yes", "y", "1" |
| TRISTATE4 | as with G_MARKUP_COLLECT_BOOLEAN, but in the case of a missing attribute a value is set that compares equal to neither FALSE nor TRUE G_MARKUP_COLLECT_OPTIONAL is implied |
| OPTIONAL65536 | can be bitwise ORed with the other fields. If present, allows the attribute not to appear. A default value is set depending on what value type is used |
A mixed enumerated type and flags field. You must specify one type (string, strdup, boolean, tristate). Additionally, you may optionally bitwise OR the type with the flag G_MARKUP_COLLECT_OPTIONAL.
It is likely that this enum will be extended in the future to support other types.