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RCS file: /home/cvs/OpenXM/doc/issac2000/data-format.tex,v
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--- OpenXM/doc/issac2000/data-format.tex	1999/12/23 10:25:08	1.1
+++ OpenXM/doc/issac2000/data-format.tex	2000/01/16 06:02:41	1.8
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-% $OpenXM$
+% $OpenXM: OpenXM/doc/issac2000/data-format.tex,v 1.7 2000/01/15 12:18:42 takayama Exp $
 
+\section{Data Format}   
+
+OpenXM admits multiple mathematical encodings such as OpenMath, MP, CMO
+(Common Mathematical Object format).
+OpenXM itself does not exhibit a bias towards a particular encodings 
+as a main mathematical data carrier and an OpenXM compliant system do not need to
+implement all possible data formats.
+However  they should at least implement seven primitive 
+data types of the CMO, which are necessary to 
+carry several control informations such as a {\it mathcap}.
+Mathcap is a list of supported CMO's, OpenXM stack machine codes, 
+and necessary extra informations.
+If a program sends an OX messages unknown to its peer, 
+an unrecoverable error may occur. 
+By exchanging mathcaps a program knows its peer's capability 
+and such an error can be avoided.
+Mathcap is also defined as a CMO.
+See \cite{noro-takayama} for the details.
+
+Encoding types of OX data are distinguished with tags
+of OX messages.
+For example,
+an OX message with the tag 
+{\tt OX\_DATA} is followed by a CMO packet.
+An OX message with the tag 
+{\tt OX\_DATA\_OPENMATH\_XML} is followed by 
+an OpenMath XML string.
+
+Let us explain the data format of CMO.
+Any CMO packet consists of a header and a body.
+The size of the header is 4 bytes that tags the data type of the body.
+Data type tags are signed 32 bit integers which is called {\sl int32} in this
+paper.
+Following tags are registered in the OpenXM.
+\begin{verbatim}
+#define CMO_ERROR2                         0x7f000002
+#define CMO_NULL                           1
+#define CMO_INT32                          2
+#define CMO_DATUM                          3
+#define CMO_STRING                         4
+#define CMO_MATHCAP                        5
+#define CMO_LIST                           17
+
+#define CMO_MONOMIAL32                     19
+#define CMO_ZZ                             20
+#define CMO_QQ                             21
+#define CMO_ZERO                           22
+#define CMO_DMS_GENERIC                    24
+#define CMO_DMS_OF_N_VARIABLES             25
+#define CMO_RING_BY_NAME                   26
+#define CMO_RECURSIVE_POLYNOMIAL           27
+#define CMO_LIST_R                         28
+#define CMO_INT32COEFF                     30
+#define CMO_DISTRIBUTED_POLYNOMIAL         31
+#define CMO_POLYNOMIAL_IN_ONE_VARIABLE     33
+#define CMO_RATIONAL                       34
+#define CMO_64BIT_MACHINE_DOUBLE           40
+#define CMO_ARRAY_OF_64BIT_MACHINE_DOUBLE  41
+#define CMO_BIGFLOAT                       50
+#define CMO_IEEE_DOUBLE_FLOAT              51
+#define CMO_INDETERMINATE                  60
+#define CMO_TREE                           61
+#define CMO_LAMBDA                         62
+\end{verbatim}
+The first seven primitive types should be implemented 
+on all OpenXM compliant systems.
+The formats are as follows. \\
+\begin{tabular}{|c|c|}
+\hline
+{\sl int32} {\tt CMO\_ERROR2} & {\sl CMObject} {\rm ob} \\ 
+\hline
+\end{tabular} \\
+\begin{tabular}{|c|c|}
+\hline
+{\sl int32} {\tt CMO\_NULL}  \\ 
+\hline
+\end{tabular} \\
+\begin{tabular}{|c|c|}
+\hline
+{\sl int32} {\tt CMO\_INT32}& {\sl int32} {\rm n}  \\ 
+\hline
+\end{tabular} \\
+\begin{tabular}{|c|c|c|}
+\hline
+{\sl int32} {\tt CMO\_DATUM}& {\sl int32} {\rm n} & {\sl byte} {\rm  data[0]} \\
+\hline
+$\cdots$ & {\sl byte} {\rm  data[n-1]} \\ 
+\cline{1-2}
+\end{tabular} \\
+\begin{tabular}{|c|c|c|}
+\hline
+{\sl int32} {\tt CMO\_STRING}& {\sl int32} {\rm n} & {\sl byte} {\rm data[0]} \\
+\hline
+$\cdots$ & {\sl byte} {\rm data[n-1]} \\ 
+\cline{1-2}
+\end{tabular} \\
+\begin{tabular}{|c|c|}
+\hline
+{\sl int32} {\tt CMO\_MATHCAP} & {\sl CMObject} {\rm ob} \\ 
+\hline
+\end{tabular} \\
+\begin{tabular}{|c|c|c|}
+\hline
+{\sl int32} {\tt CMO\_LIST}& {\sl int32} {\rm n} & {\sl CMObject} {\rm ob[0]} \\
+\hline
+$\cdots$ & {\sl CMObject} {\rm ob[n-1]} \\ 
+\cline{1-2}
+\end{tabular} \\
+
+As to the formats of other CMO's, see \cite{noro-takayama}.
+
+When one wants to implement CMO on a server, the person proceeds 
+as follows.
+\begin{enumerate}
+\item Look for the CMO list at the web cite \cite{openxm-web}.
+If there is a CMO that fits to one's requirement, then use this CMO.     
+\item If there is no suitable CMO, design a new CMO and register 
+the new CMO to \cite{openxm-web} with a description and examples.
+\end{enumerate}