Parameters
----------
- * ``inherit`` (string: group name). Causes this group to inherit
+ * ``inherit`` [string: group name]. Causes this group to inherit
every parameter (except ``files``) from the group named by
``inherit`` (recursively, if applicable).
the usual default value: the latter would override any inherited
setting.
- * ``size`` (mandatory; 1- or 2-element array of numbers: width and height).
+ * ``size`` [mandatory; 1- or 2-element array of numbers: width and height].
The size at which the piece will show up in the game, in nominal
game coordinate units. For reference: the builtin library's chess
pieces are 9.5 units; the builtin playing cards are 9.65,17.125.
NB, this value can be affected by ``scale``.
- * ``item_prefix``, ``item_suffix`` (strings, default ``""``).
+ * ``item_prefix``, ``item_suffix`` [strings, default ``""``].
Prepaended and appended to ``ITEM-SPEC`` in ``files`` to
produce the item name.
- * ``sort`` (string).
+ * ``sort`` [string].
The sort key (used for item sorting in hands).
If neither the group parameter, nor the ``files`` extra field, are
``_s`` is replaced by the sort extra field from the ``files`` list
``_c`` is replaced by the colour, if applicable.
- * ``orig_size`` (1- or 2-element array, or (default) empty array): If
- non-empty, the supplied image is first scaled from ``orig_size``
- to ``size``. If both ``size`` and ```orig_size`` are 2 elements,
- this can scale by different amounts in x and y, distorting the
- image.
+ * ``orig_size`` [1- or 2-element array]: If specified, the supplied
+ image is first scaled from ``orig_size`` to ``size``. If both
+ ``size`` and ```orig_size`` are 2 elements, this can scale by
+ different amounts in x and y, distorting the image.