- *
- * filename => path to addressbook file
- * ? create => if true: file is created if it does not exist.
- * ? umask => umask set before opening file.
- *
+ *<pre>
+ * filename => path to addressbook file
+ * ? create => if true: file is created if it does not exist.
+ * ? umask => umask set before opening file.
+ * ? name => name of address book.
+ * ? detect_writeable => detect address book access permissions by
+ * checking file permissions.
+ * ? writeable => allow writing into address book. Used only when
+ * detect_writeable is set to false.
+ *</pre>