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<b>POI 1.0 Vision Document</b>
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<p>
<a href="mailto:"></a>
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>Preface</b></font></font></td>
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<td>
<br>
<p align="justify">
(21-Jan-02) While this document is just full of useful project
introductory information and I do suggest those interested in getting
involved in the project read it, it is woefully out of date.
</p>
<p align="justify">
We deliberately allowed this document to run out of date because it
is a good reflection of what the original vision was for POI 1.0.
You'll note that some of the terminology is not used in quite the same
way any longer. I've made some minor corrections where reading this
confused me. An example: in some places this document may refer to
POI API instead of POIFS API. When this vision was written we had
an incomplete understanding of the project.
</p>
<p align="justify">
Lastly, the scope of the project expanded dramatically near the end
of the 1.0 cycle. Our vision at the time was to focus merely on the
Excel port (having no idea how the project would grow or be received)
and provide the OLE 2 Compound Document port for others to port later
formats. We now plan to spearhead these ports under the umbrella of
the POI project. So, you've been warned. Read on, but just realize
that we had a fuzzy view of things to come, and hindsight is 20-20.
</p>
<p align="justify">
If I recall major holes were: a complete understanding of the format
of OLE 2 Compound Document format, Excel file format, and exactly how
Cocoon 2 Serializers worked. (that just about covers the whole range
huh?)
</p>
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>1. Introduction</b></font></font></td>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>1.1 Purpose of this document</b></font></font></td>
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<td>
<br>
<p align="justify">
The purpose of this document is to
collect, analyze and define high-level requirements, user needs and
features of the HSSF Serializer for Cocoon 2 and related libraries.
The HSSF Serializer is a java class supporting the Serializer
interface from the Cocoon 2 project and outputting in a compatible
format of that used by the spreadsheet program Microsoft Excel '97.
The HSSF Serializer will be responsible for converting XML
spreadsheet-like documents into Excel-compatible XLS spreadsheets.
</p>
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>1.2 Project Overview</b></font></font></td>
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<td>
<br>
<p align="justify">
Many web apps today hit a brick wall
when it comes to the user request that they be able to easily
manipulate their reports and data extracts in the popular Microsoft
Excel spreadsheet format. This often causes inferior technologies to be
chosen for the project simply because they easily support this
format. This project seeks to extend existing XML, Java and Apache
Cocoon 2 project technologies by:
</p>
<ul>
<li>
providing an extensible library
(POIFS) which reads/writes in a compatable format to OLE 2 Compound
Document Format (aka Structured Storage Format) for easy
implementation of other document types;
</li>
<li>
providing a library (HSSF) for
manipulating spreadsheet data and outputting it in a compatible
format to Microsoft Excel XLS format;
</li>
<li>
and providing a Cocoon 2
Serializer (HSSFSerializer) for serializing XML documents as
Excel-compatible spreadsheets.
</li>
</ul>
</td>
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>2. User Description</b></font></font></td>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>2.1 User/Market Demographics</b></font></font></td>
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<td>
<br>
<p align="justify">
There are a number of enthusiastic
users of XML, UNIX and Java technology. Secondly, the Microsoft
solution for outputting Office Document formats often involves
actually manipulating the software as an OLE Server. This method
provides extremely low performance, extremely high overhead and is
only capable of handing one document at a time.
</p>
<ol>
<li>
Our intended audience for the HSSF
Serializer portion of this project are developers writing reports or
data extracts in XML format.
</li>
<li>
Our intended audience for the HSSF
library portion of this project is ourselves as we are developing
the serializer and anyone who needs to write to Excel spreadsheets
in a non-XML Java environment or who has specific needs not
addressed by the Serializer.
</li>
<li>
Our intended audience for the
"POIFS" OLE 2 Compound Document format reader/writer is
ourselves as we are writing the HSSF library and secondly, anyone
wishing to provide other libraries for reading/writing OLE 2
Compound Document Format in Java.
</li>
</ol>
</td>
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>2.2. User environment</b></font></font></td>
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<td>
<br>
<p align="justify">
The users of this software shall be
developers in a Java environment on any Operating System or power
users who are capable of XML document generation/deployment.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>2.3. Key User Needs</b></font></font></td>
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<td>
<br>
<p align="justify">
The OLE 2 Compound Document format is
undocumented for all practical purposes and cryptic for all
impractical purposes. Developer needs in this area include
documentation and an easy to use library for reading and writing in
this format without requiring the developer to have intimate
knowledge of the format.
</p>
<p align="justify">
There is currently no good way to write
to Microsoft Excel documents from Java or from a non-Microsoft
Windows based platform for that matter. Developers need an easy to
use library that supports a reasonable feature set and allows
seperation of data from formatting/stylistic concerns.
</p>
<p align="justify">
There is currently no good way to
transform XML data to Microsoft Excel. Apache's Cocoon 2 project
supplies a complete framework for XML, but nothing for outputting in
Excel's XLS format. Developers and power users alike need a simple
method to output XML documents to Excel through server-side
processing.
</p>
</td>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>2.4. Alternatives and Competition</b></font></font></td>
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<tr>
<td>
<br>
<p align="justify">
The alternative to this project is to
buy the $10,000 Formula 1 library (<a href="http://www.tidestone.com/">www.tidestone.com</a>)
and accept its crude api and limitations. As a second alternative,
give up XML and write Visual Basic code on a Microsoft Windows based
Environment or output in Microsoft's beta and primarily undocumented
XML for office format.
</p>
</td>
</tr>
</table>
</div>
<br>
</td>
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</table>
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<br>
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<table cellspacing="0" cellpadding="2" border="0" width="100%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>3. Project Overview</b></font></font></td>
</tr>
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>3.1. Project Perspective</b></font></font></td>
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<td>
<br>
<p align="justify">
The produced code shall be licensed by
the Apache License as used by the Cocoon 2 project and maintained on
a project page until such time as the Cocoon 2 developers accept it
as a donation (at which time the copyright will be turned over to
them).
</p>
</td>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>3.2. Project Position Statement</b></font></font></td>
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<br>
<p align="justify">
For developers on a Java and/or XML
environment this project will provide all the tools necessary for
outputting XML data in the Microsoft Excel format. This project seeks
to make the use of Microsoft Windows based servers unnecessary for
file format considerations and to fully document the OLE 2 Compound
Document format. The project aims not only to provide the tools for
serializing XML to Excel's file format and the tools for writing to
that file format from Java, but also to provide the tools for later
projects to convert other OLE 2 Compound Document formats to pure
Java APIs.
</p>
</td>
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</table>
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>3.3. Summary of Capabilities</b></font></font></td>
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<td>
<br>
<p align="justify">
HSSF Serializer for Apache Cocoon 2
</p>
<table width="100%" cellspacing="2" cellpadding="2" border="0">
<tr>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Benefit
</font></td>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Supporting Features
</font></td>
</tr>
<tr>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Standard XML tag language for sheet data
</font></td>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Serializer will transform documents utilizing a defined tag
language
</font></td>
</tr>
<tr>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Utilize XML to output in Excel
</font></td>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Serializer will output in Excel
</font></td>
</tr>
<tr>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Java API to output in Excel on any platform
</font></td>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
The project will develop an API that outputs in Excel using
pure Java.
</font></td>
</tr>
<tr>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
Make it easy for developers to port other OLE 2 Compound
Document-based formats to Java.
</font></td>
<td valign="top" bgcolor="#a0ddf0" align="left"><font size="-1" color="#000000">
The POIFS library will contain both a high-level abstraction
along with low-level constructs. The project will fully document
the OLE 2 Compound Document Format.
</font></td>
</tr>
</table>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>3.4. Assumptions and Dependencies</b></font></font></td>
</tr>
<tr>
<td>
<br>
<ul>
<li>
The HSSF Serializer will run on
any Java 2 supporting platform with Apache Cocoon 2 installed along
with the HSSF and POIFS APIs.
</li>
<li>
The HSSF API requires a Java 2
implementation and the POI API.
</li>
<li>
The POIFS API requires a Java 2
implementation.
</li>
</ul>
</td>
</tr>
</table>
</div>
<br>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="100%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>4. Project Features</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The POIFS API will include:
</p>
<ul>
<li>
Low level structures representing
the structures in a POI filesystems.
</li>
<li>
A low-level API for
creating/manipulating POI filesystems.
</li>
<li>
A set of high level interfaces
abstracting the user from the POI filesystem constructs and
representing it as a standard filesystem (Files, directories, etc)
</li>
</ul>
<p align="justify">
The HSSF API will include:
</p>
<ul>
<li>
Low level structures representing
the structures in an Excel file.
</li>
<li>
A low-level API for creating and
manipulating Excel files and writing them into POI filesystems.
</li>
<li>
A high level model and style
interface for manipulating spreadsheet data without knowing anything
about the Excel format itself.
</li>
</ul>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>4.1 POI Filesystem API</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The POI Filesystem API includes:
</p>
<ul>
<li>An implementation of Big Blocks</li>
<li>An implementation of Small Blocks</li>
<li>An implementation of Header Blocks</li>
<li>An implementation of Block Allocation Tables</li>
<li>An implementation of Property Sets</li>
<li>An implementation of the POI
filesystem including functions to get and set the above constructs;
compound functions for reading/writing files/directories.
</li>
<li>An abstraction of the POI
filesystem providing interfaces representing Files, Directories,
FileSystems in normal terminology and encapulating the above
constructs.
</li>
<li>Full documentation of the POI file
format.
</li>
<li>Full documentation of the APIs and
interfaces provided through Javadoc, user documentation (aimed at
developers using the APIs)
</li>
<li>Examples aimed at teaching the
user to write code using POI. (titled: recipes for POI)
</li>
<li>Performance specifications.
(Example POI filesystems rated by some measure of complexity along
with system specifications and execution times for given operations)
</li>
</ul>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>4.2 HSSF API</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The HSSF API includes:
</p>
<ul>
<li>An implementation of Record
(binary 2 byte type followed by 2 byte size (n) followed by n bytes)</li>
<li>Implementations of many standard
record types mapping the data bytes to fields along with methods to
reserialize those fields</li>
<li>An implementation of the HSSF File
including functions to get/set the above constructs, create a blank
file with the minimum required record types and mappings between
getting/setting data and style in a workbook to the creation of
record types, and read HSSF files.</li>
<li>An abstraction of the HSSF file
format providing interfaces representing the HSSF File, HSSF
Workbook, HSSF Sheet, HSSF Column, HSSF Formulas in a manner
seperating the data from the styling and encapsulating the above
constructs.</li>
<li>Full documentation of the HSSF
file format (which will be a subset of the Excel '97 File format).
This must be done with care for legal reasons.</li>
<li>Full documentation of the APIs and
interfaces provided through Javadoc, user documentation (aimed at
developers using the apis).</li>
<li>Examples aimed at teaching
developers to use the APIs.
</li>
<li>Performance specifications.
(Example files rated by some measure of complexity along with system
specifications and execution times for given operations - possibly
the same files used for POI's tests)</li>
</ul>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>4.3 HSSF Serializer</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The HSSF Serializer subproject:
</p>
<ul>
<li>A class supporting the Cocoon 2
Serializer Interface.</li>
<li>An interface between the SAX
events and the HSSF APIs.</li>
<li>A specified tag language for using
with the Serializer.</li>
<li>Documentation on the tag language
for the HSSF Serializer</li>
<li>Normal javadocs.</li>
<li>Example XML files</li>
<li>Performance specifications.
(Example XML docs and stylesheets rated by some measure of
complexity along with system specifications and execution times)</li>
</ul>
</td>
</tr>
</table>
</div>
<br>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="100%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>5. Other Product Requirements</b></font></font></td>
</tr>
<tr>
<td>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>5.1. Applicable Standards</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
All Java code will be 100% pure Java.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>5.2. System Requirements</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The minimum system requirements for POIFS are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
</ul>
<p align="justify">
The minimum system requirements for HSSF are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>POIFS API</li>
</ul>
<p align="justify">
The minimum system requirements for the HSSF Serializer are:
</p>
<ul>
<li>64 Mbytes memory</li>
<li>Java 2 environment</li>
<li>Pentium or better processor (or equivalent on other platforms)</li>
<li>Cocoon 2</li>
<li>HSSF API</li>
<li>POI API</li>
</ul>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>5.3. Performance Requirements</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
All components must perform well enough
to be practical for use in a webserver environment (especially
Cocoon2/Tomcat/Apache combo)
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>5.4. Environmental Requirements</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The software will run primarily in
developer environments. We should make some allowances for
not-highly-technical users to write XML documents for the HSSF
Serializer. All other components will assume intermediate Java 2
knowledge. No XML knowledge will be required except for using the
HSSF Serializer. As much documentation as is practical shall be
required for all components as XML is relatively new, and the
concepts introduced for writing spreadsheets and to POI filesystems
will be brand new to Java and many Java developers.
</p>
</td>
</tr>
</table>
</div>
<br>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="100%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>6. Documentation Requirements</b></font></font></td>
</tr>
<tr>
<td>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>6.1 POI Filesystem</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The filesystem as read and written by
POI shall be fully documented and explained so that the average Java
developer can understand it.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>6.2. POI API</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The POI API will be fully documented
through Javadoc. A walkthrough of using the high level POI API shall
be provided. No documentation outside of the Javadoc shall be
provided for the low-level POI APIs.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>6.3. HSSF File Format</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The HSSF File Format as implemented by
the HSSF API will be fully documented. No documentation will be
provided for features that are not supported by HSSF API that are
supported by the Excel 97 File Format. Care will be taken not to
infringe on any "legal stuff".
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>6.4. HSSF API</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The HSSF API will be documented by
javadoc. A walkthrough of using the high level HSSF API shall be
provided. No documentation outside of the Javadoc shall be provided
for the low level HSSF APIs.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>6.5. HSSF Serializer</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The HSSF Serializer will be documented
by javadoc.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>6.6 HSSF Serializer Tag language</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
The XML tag language along with
function and usage shall be fully documented. Examples will be
provided as well.
</p>
</td>
</tr>
</table>
</div>
<br>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="100%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>7. Terminology</b></font></font></td>
</tr>
<tr>
<td>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>7.1 Filesystem</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
filesystem shall refer only to the POI formatted archive.
</p>
</td>
</tr>
</table>
</div>
<br>
<div align="right">
<table cellspacing="0" cellpadding="2" border="0" width="99%">
<tr>
<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>7.2 File</b></font></font></td>
</tr>
<tr>
<td>
<br>
<p align="justify">
file shall refer to the embedded data stream within a
POI filesystem. This will be the actual embedded document.
</p>
</td>
</tr>
</table>
</div>
<br>
</td>
</tr>
</table>
</div>
<br>
</td>
</tr>
</table>
<br>
<table cellpadding="0" cellspacing="0" border="0" width="100%">
<tr>
<td>
<hr size="1" noshade="">
</td>
</tr>
<tr>
<td align="center"><font color="#525D76" size="-1" face="arial,helvetica,sanserif"><i>
Copyright ©2002 Apache Software Foundation
</i></font></td><td width="5%" align="right"><img src="images/cocoon2-small.jpg" align="right" border="0" vspace="0" hspace="0"></td>
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