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       XkbAddGeomProperty - Add one property to an existing keyboard geometry description


       XkbPropertyPtr XkbAddGeomProperty (XkbGeometryPtr geom, char *name, char *value);


       - geom geometry to be updated

       - name name of the new property

       - value
              value for the new property


       Xkb  provides functions to add a single new element to the top-level keyboard geometry. In
       each case the num_ * fields of the corresponding structure  is  incremented  by  1.  These
       functions  do  not  change  sz_*  unless there is no more room in the array. Some of these
       functions fill in the values of the element's structure  from  the  arguments.  For  other
       functions, you must explicitly write code to fill the structure's elements.

       The  top-level  geometry  description  includes a list of geometry properties.  A geometry
       property associates an arbitrary string with an  equally  arbitrary  name.  Programs  that
       display  images  of  keyboards  can  use  geometry  properties  as hints, but they are not
       interpreted by Xkb. No other geometry structures refer to geometry properties.

       XkbAddGeomProperty adds one property with the specified name and  value  to  the  keyboard
       geometry  specified  by  geom. XkbAddGeomProperty returns NULL if any of the parameters is
       empty or if it was not able to allocate space for the property. To allocate space  for  an
       arbitrary number of properties, use the XkbAllocGeomProps function.


           typedef struct _XkbProperty {
               char *         name;       /∗ property name */
               char *         value;      /∗ property value */
           } XkbPropertyRec,*XkbPropertyPtr;