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+
+Syntax
+------
+
+.. code::
+
+   #include <plhash.h>
+
+   typedef struct PLHashEntry PLHashEntry;
+
+
+Description
+-----------
+
+``PLHashEntry`` is a structure that represents an entry in the hash
+table. An entry has a key and a value, represented by the following
+fields in the ``PLHashEntry`` structure.
+
+.. code::
+
+   const void *key;
+   void *value;
+
+The key field is a pointer to an opaque key. The value field is a
+pointer to an opaque value. If the key of an entry is an integral value
+that can fit into a ``void *`` pointer, you can just cast the key itself
+to ``void *`` and store it in the key field. Similarly, if the value of
+an entry is an integral value that can fit into a ``void *`` pointer,
+you can cast the value itself to ``void *`` and store it in the value
+field.
+
+.. warning::
+
+   **Warning**: There are other fields in the ``PLHashEntry`` structure
+   besides key and value. These fields are for use by the hash table
+   library functions and the user should not tamper with them.