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.
used to terminate the list of attributes to collect
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
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()
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"
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
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