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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> + 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> + 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> +</div> + + +<a name="1.+Introduction"></a> +<h2 class="boxed">1. Introduction</h2> +<div class="section"> +<a name="1.1+Purpose+of+this+document"></a> +<h3 class="boxed">1.1 Purpose of this document</h3> +<p> + 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> +<a name="1.2+Project+Overview"></a> +<h3 class="boxed">1.2 Project Overview</h3> +<p> + 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 compatible 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> +</div> + +<a name="2.+User+Description"></a> +<h2 class="boxed">2. User Description</h2> +<div class="section"> +<a name="2.1+User%2FMarket+Demographics"></a> +<h3 class="boxed">2.1 User/Market Demographics</h3> +<p> + 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 handling 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> +<a name="2.2.+User+environment"></a> +<h3 class="boxed">2.2. User environment</h3> +<p> + 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> +<a name="2.3.+Key+User+Needs"></a> +<h3 class="boxed">2.3. Key User Needs</h3> +<p> + 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> + 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> + 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> +</div> + +<a name="3.+Project+Overview"></a> +<h2 class="boxed">3. Project Overview</h2> +<div class="section"> +<a name="3.1.+Project+Perspective"></a> +<h3 class="boxed">3.1. Project Perspective</h3> +<p> + 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> +<a name="3.2.+Project+Position+Statement"></a> +<h3 class="boxed">3.2. Project Position Statement</h3> +<p> + 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> +<a name="3.3.+Summary+of+Capabilities"></a> +<h3 class="boxed">3.3. Summary of Capabilities</h3> +<p> + HSSF Serializer for Apache Cocoon 2 + </p> +<table class="ForrestTable" cellspacing="1" cellpadding="4"> + +<tr> + +<td colspan="1" rowspan="1"> + Benefit + </td> + <td colspan="1" rowspan="1"> + Supporting Features + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Standard XML tag language for sheet data + </td> + <td colspan="1" rowspan="1"> + Serializer will transform documents utilizing a defined tag + language + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Utilize XML to output in Excel + </td> + <td colspan="1" rowspan="1"> + Serializer will output in Excel + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Java API to output in Excel on any platform + </td> + <td colspan="1" rowspan="1"> + The project will develop an API that outputs in Excel using + pure Java. + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Make it easy for developers to port other OLE 2 Compound + Document-based formats to Java. + </td> + <td colspan="1" rowspan="1"> + 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. + </td> + +</tr> + +</table> +<a name="3.4.+Assumptions+and+Dependencies"></a> +<h3 class="boxed">3.4. Assumptions and Dependencies</h3> +<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> +</div> + +<a name="4.+Project+Features"></a> +<h2 class="boxed">4. Project Features</h2> +<div class="section"> +<p> + 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> + 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> +<a name="4.1+POI+Filesystem+API"></a> +<h3 class="boxed">4.1 POI Filesystem API</h3> +<p> + 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> +<a name="4.2+HSSF+API"></a> +<h3 class="boxed">4.2 HSSF API</h3> +<p> + 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> +<a name="4.3+HSSF+Serializer"></a> +<h3 class="boxed">4.3 HSSF Serializer</h3> +<p> + 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> +</div> + +<a name="5.+Other+Product+Requirements"></a> +<h2 class="boxed">5. Other Product Requirements</h2> +<div class="section"> +<a name="5.1.+Applicable+Standards"></a> +<h3 class="boxed">5.1. Applicable Standards</h3> +<p> + All Java code will be 100% pure Java. + </p> +<a name="5.2.+System+Requirements"></a> +<h3 class="boxed">5.2. System Requirements</h3> +<p> + 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> + 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> + 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> +<a name="5.3.+Performance+Requirements"></a> +<h3 class="boxed">5.3. Performance Requirements</h3> +<p> + All components must perform well enough + to be practical for use in a webserver environment (especially + Cocoon2/Tomcat/Apache combo) + </p> +<a name="5.4.+Environmental+Requirements"></a> +<h3 class="boxed">5.4. Environmental Requirements</h3> +<p> + 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> +</div> + +<a name="6.+Documentation+Requirements"></a> +<h2 class="boxed">6. Documentation Requirements</h2> +<div class="section"> +<a name="6.1+POI+Filesystem"></a> +<h3 class="boxed">6.1 POI Filesystem</h3> +<p> + The filesystem as read and written by + POI shall be fully documented and explained so that the average Java + developer can understand it. + </p> +<a name="6.2.+POI+API"></a> +<h3 class="boxed">6.2. POI API</h3> +<p> + 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> +<a name="6.3.+HSSF+File+Format"></a> +<h3 class="boxed">6.3. HSSF File Format</h3> +<p> + 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> +<a name="6.4.+HSSF+API"></a> +<h3 class="boxed">6.4. HSSF API</h3> +<p> + 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> +<a name="6.5.+HSSF+Serializer"></a> +<h3 class="boxed">6.5. HSSF Serializer</h3> +<p> + The HSSF Serializer will be documented + by javadoc. + </p> +<a name="6.6+HSSF+Serializer+Tag+language"></a> +<h3 class="boxed">6.6 HSSF Serializer Tag language</h3> +<p> + The XML tag language along with + function and usage shall be fully documented. Examples will be + provided as well. + </p> +</div> + +<a name="7.+Terminology"></a> +<h2 class="boxed">7. Terminology</h2> +<div class="section"> +<a name="7.1+Filesystem"></a> +<h3 class="boxed">7.1 Filesystem</h3> +<p> + filesystem shall refer only to the POI formatted archive. + </p> +<a name="7.2+File"></a> +<h3 class="boxed">7.2 File</h3> +<p> + file shall refer to the embedded data stream within a + POI filesystem. This will be the actual embedded document. + </p> +</div> + +<p align="right"> +<font size="-2">by Andrew C. Oliver, Marcus W. Johnson</font> +</p> +</div> +<!--+ + |end content + +--> +<div class="clearboth"> </div> +</div> +<div id="footer"> +<!--+ + |start bottomstrip + +--> +<div class="lastmodified"> +<script type="text/javascript"><!-- +document.write("Last Published: " + document.lastModified); +// --></script> +</div> +<div class="copyright"> + Copyright © + 2001-2018 <a href="https://www.apache.org/";>The Apache Software Foundation</a> +</div> +<div id="feedback"> + Send feedback about the website to: + <a id="feedbackto" href="mailto:[email protected]?subject=Feedback%C2%A0devel/plan/vision10.html";>[email protected]</a> +</div> +<!--+ + |end bottomstrip + +--> +</div> +</body> +</html>
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Although the vision + has not changed and this document is certainly not out of date and + the vision has not changed, the structure of the project has + changed a bit. We're not going to change the vision document to + reflect this (however proper that may be) because it would only + involve deletion. There is no purpose in providing less + information provided we give clarification. + </p> +<p> + This document was created before the POI components for + <a href="http://xml.apache.org/cocoon";>Apache Cocoon</a> + were accepted into the Cocoon project itself. It was also + written before POI was accepted into Jakarta. So while the + vision hasn't changed some of the components are actually now + part of other projects. We'll still be working on them on the + same timeline roughly (minus the overhead of coordination with + other groups), but they are no longer technically part of the + POI project itself. + </p> +</div> + + +<a name="1.+Introduction"></a> +<h2 class="boxed">1. Introduction</h2> +<div class="section"> +<a name="1.1+Purpose+of+this+document"></a> +<h3 class="boxed">1.1 Purpose of this document</h3> +<p> + The purpose of this document is to + collect, analyze and define high-level requirements, user needs, + and features of the second release of the POI project software. + The POI project currently consists of the following components: + the HSSF Serializer, the HSSF library and the POIFS library. + </p> +<ul> + +<li> + The HSSF Serializer is a set of Java classes whose main + class supports the Serializer interface from the Cocoon + 2 project and outputs the serialized data in a format + compatible with the spreadsheet program Microsoft Excel + '97. + </li> + +<li> + The HSSF library is a set of classes for reading and + writing Microsoft Excel 97 file format using pure Java. + </li> + +<li> + The POIFS library is a set of classes for reading and + writing Microsoft's OLE 2 Compound Document format using + pure Java. + </li> + +</ul> +<p>By the completion of this release cycle the POI project will also + include the HSSF Generator and the HWPF library. + </p> +<ul> + +<li>The HSSF Generator will be responsible for using HSSF to read + in the XLS (Excel 97) file format and create SAX events. The HSSF + Generator will support the applicable interfaces specified by the + Apache Cocoon 2 project. + </li> + +<li>The HWPF library will provide a set of high level interfaces + for reading and writing Microsoft Word 97 file format using pure + Java.</li> + +</ul> +<a name="1.2+Project+Overview"></a> +<h3 class="boxed">1.2 Project Overview</h3> +<p> + The first release of the POI project + was an astounding success. This release seeks to build on that + success by: + </p> +<ul> + +<li> + Refactoring POIFS into input and + output classes as well as an event-driven API for reading. + </li> + +<li> + Refactor HSSF for greater + performance as well as an event-driven API for reading + </li> + +<li> + Extend HSSF by adding the ability to read and write formulas. + </li> + +<li> + Extend HSSF by adding the ability to read and write + user-defined styles. + </li> + +<li> + Create a Cocoon 2 Generator for HSSF using the same tags + as the HSSF Serializer. + </li> + +<li> + Create a new library (HWPF) for reading and writing + Microsoft Word DOC format. + </li> + +<li> + Refactor the HSSFSerializer into a separate extensible + POIFSSerializer and HSSFSerializer + </li> + +<li> + Providing the create excel charts. (write only) + </li> + +</ul> +</div> + +<a name="2.+User+Description"></a> +<h2 class="boxed">2. User Description</h2> +<div class="section"> +<a name="2.1+User%2FMarket+Demographics"></a> +<h3 class="boxed">2.1 User/Market Demographics</h3> +<p> + There are a number of enthusiastic + users of XML, UNIX and Java technology. Furthermore, 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 HSSF serializer and anyone who needs to read and write 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 library is ourselves as we are developing the HSSF and HWPF + libraries and anyone wishing to provide other libraries for + reading/writing other file formats utilizing the OLE 2 Compound + Document Format in Java. + </li> + +<li> + Our intended audience for the HSSF + generator are developers who need to export Excel spreadsheets to + XML in a non-proprietary environment. + </li> + +<li> + Our intended audience for the HWPF + library is ourselves, as we will be developing a HWPF Serializer in a + later release, and anyone wishing to add .DOC file processing and + creation to their projects. + </li> + +</ol> +<a name="2.2.+User+environment"></a> +<h3 class="boxed">2.2. User environment</h3> +<p> + 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> +<a name="2.3.+Key+User+Needs"></a> +<h3 class="boxed">2.3. Key User Needs</h3> +<p> + The HSSF library currently requires a + full object representation to be created before reading values. This + results in very high memory utilization. We need to reduce this + substantially for reading. It would be preferable to do this for + writing, but it may not be possible due to the constraints imposed by + the file format itself. Memory utilization during read is our top + user complaint. + </p> +<p> + The POIFS library currently requires a + full object representation to be created before reading values. This + results in very high memory utilization. We need to reduce this + substantially for reading. + </p> +<p> + The HSSF library currently ignores + formula cells and identifies them as "UnknownRecord" at the + lower level of the API. We must provide a way to read and write + formulas. This is now the top requested feature. + </p> +<p> + The HSSF library currently does not support + charts. This is a key requirement of some users who wish to use HSSF + in a reporting engine. + </p> +<p> + The HSSF Serializer currently does not + provide serialization for cell styling. User's will want stylish + spreadsheets to result from their XML. + </p> +<p> + There is currently no way to generate + the XML from an XLS that is consistent with the format used by the + HSSF Serializer. + </p> +<p> + There should be a way to read and write + the DOC file format using pure Java. + </p> +</div> + +<a name="3.+Project+Overview"></a> +<h2 class="boxed">3. Project Overview</h2> +<div class="section"> +<a name="3.1.+Project+Perspective"></a> +<h3 class="boxed">3.1. Project Perspective</h3> +<p> + The produced code shall be licensed by + the Apache License as used by the Cocoon 2 project (APL 1.1) and + maintained on at <a href="http://poi.sourceforge.net/";>http://poi.sourceforge.net</a> + and <a href="http://sourceforge.net/projects/poi";>http://sourcefoge.net/projects/poi</a>. + It is our hope to at some point integrate with the various Apache + projects (xml.apache.org and jakarta.apache.org), at which point we'd + turn the copyright over to them. + </p> +<a name="3.2.+Project+Position+Statement"></a> +<h3 class="boxed">3.2. Project Position Statement</h3> +<p> + 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 and Word file formats and the tools for + writing to those file formats from Java, but also to provide the + tools for later projects to convert other OLE 2 Compound Document + formats to pure Java APIs. + </p> +<a name="3.3.+Summary+of+Capabilities"></a> +<h3 class="boxed">3.3. Summary of Capabilities</h3> +<p> + HSSF Serializer for Apache Cocoon 2 + </p> +<table class="ForrestTable" cellspacing="1" cellpadding="4"> + +<tr> + +<th colspan="1" rowspan="1"> + Benefit + </th> + <th colspan="1" rowspan="1"> + Supporting Features + </th> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Ability to serialize styles from XML spreadsheets. + </td> + <td colspan="1" rowspan="1"> + HSSFSerializer will support styles. + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Ability to read and write formulas in XLS files. + </td> + <td colspan="1" rowspan="1"> + HSSF will support reading/writing formulas. + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Ability to output in MS Word on any platform using Java. + </td> + <td colspan="1" rowspan="1"> + The project will develop an API that outputs in Word format + using pure Java. + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Enhance performance for reading and writing XLS files. + </td> + <td colspan="1" rowspan="1"> + HSSF will undergo a number of performance enhancements. HSSF + will include a new event-based API for reading XLS files. POIFS + will support a new event-based API for reading OLE2 CDF files. + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + Ability to generate XML from XLS files + </td> + <td colspan="1" rowspan="1"> + The project will develop an HSSF Generator. + </td> + +</tr> + +<tr> + +<td colspan="1" rowspan="1"> + The ability to generate charts + </td> + <td colspan="1" rowspan="1"> + HSSF will provide low level support for chart records as well + as high level API support for generating charts. The ability + to read chart information will not initially be provided. + </td> + +</tr> + + +</table> +<a name="3.4.+Assumptions+and+Dependencies"></a> +<h3 class="boxed">3.4. Assumptions and Dependencies</h3> +<ul> + +<li> + The HSSF Serializer and Generator + will support the Gnumeric 1.0 XML tag language. + </li> + +<li> + The HSSF Generator and HSSF + Serializer will be mutually validating. It should be possible to + have an XLS file created by the Serializer run through the Generator + and the output back through the Serializer (via the Cocoon pipeline) + and get the same file or a reasonable facsimile (no one cares if it + differs by the order of the binary records in some minor but + non-visually recognizable manner). + </li> + +<li> + The HSSF Generator will run on any + Java 2 supporting platform with Apache Cocoon 2 installed along with + the HSSF and POIFS APIs. + </li> + +<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 HWPF API requires a Java 2 + implementation and the POIFS API. + </li> + +<li> + The HSSF API requires a Java 2 + implementation and the POIFS API. + </li> + +<li> + The POIFS API requires a Java 2 + implementation. + </li> + + +</ul> +</div> + +<a name="4.+Project+Features"></a> +<h2 class="boxed">4. Project Features</h2> +<div class="section"> +<p> + Enhancements to the POIFS API will + include: + </p> +<ul> + +<li> + An event driven API for reading + POIFS Filesystems. + </li> + +<li> + A low-level API for + creating/manipulating POI filesystems. + </li> + +<li> + Code improvements supporting + greater separation between read and write structures. + </li> + +</ul> +<p> + Enhancements to the HSSF API will + include: + </p> +<ul> + +<li> + An event driven API for reading + XLS files. + </li> + +<li> + Performance improvements. + </li> + +<li> + Formula support (read/write) + </li> + +<li> + Support for user-defined data + formats + </li> + +<li> + Better documentation of the file + format and structure. + </li> + +<li> + An API for creation of charts. + </li> + +</ul> +<p> + The HSSF Generator will include: + </p> +<ul> + +<li> + A set of classes supporting the + Cocoon 2 Generator interfaces providing a method for reading XLS + files and outputting SAX events. + </li> + +<li> + The same tag format used by the + HSSFSerializer in any given release. + </li> + +</ul> +<p> + The HWPF API will include: + </p> +<ul> + +<li> + An event driven API for reading + DOC files. + </li> + +<li> + A set of high and low level APIs + for reading and writing DOC files. + </li> + +<li> + Documentation of the DOC file + format or enhancements to existing documentation. + </li> + +</ul> +</div> + +<a name="5.+Other+Product+Requirements"></a> +<h2 class="boxed">5. Other Product Requirements</h2> +<div class="section"> +<a name="5.1.+Applicable+Standards"></a> +<h3 class="boxed">5.1. Applicable Standards</h3> +<p> + All Java code will be 100% pure Java. + </p> +<a name="5.2.+System+Requirements"></a> +<h3 class="boxed">5.2. System Requirements</h3> +<p> + The minimum system requirements for the POIFS API 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> + The minimum system requirements for the the HSSF API 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> + The minimum system requirements for the the HWPF API 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> + 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> +<a name="5.3.+Performance+Requirements"></a> +<h3 class="boxed">5.3. Performance Requirements</h3> +<p> + All components must perform well enough + to be practical for use in a webserver environment (especially + the "killer trio": Cocoon2/Tomcat/Apache combo) + </p> +<a name="5.4.+Environmental+Requirements"></a> +<h3 class="boxed">5.4. Environmental Requirements</h3> +<p> + 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> +</div> + +<a name="6.+Documentation+Requirements"></a> +<h2 class="boxed">6. Documentation Requirements</h2> +<div class="section"> +<a name="6.1+POI+Filesystem"></a> +<h3 class="boxed">6.1 POI Filesystem</h3> +<p> + The filesystem as read and written by + POI shall be fully documented and explained so that the average Java + developer can understand it. + </p> +<a name="6.2.+POI+API"></a> +<h3 class="boxed">6.2. POI API</h3> +<p> + 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> +<a name="6.3.+HSSF+File+Format"></a> +<h3 class="boxed">6.3. HSSF File Format</h3> +<p> + 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". Additionally, we are + collaborating with the fine folks at OpenOffice.org on + *free* documentation of the format. + </p> +<a name="6.4.+HSSF+API"></a> +<h3 class="boxed">6.4. HSSF API</h3> +<p> + 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> +<a name="6.5+HWPF+API"></a> +<h3 class="boxed">6.5 HWPF API</h3> +<p> + The HWPF API will be documented by + javadoc. A walkthrough of using the high level HWPF API shall be + provided. No documentation outside of the Javadoc shall be provided + for the low level HWPF APIs. + </p> +<a name="6.6+HSSF+Serializer"></a> +<h3 class="boxed">6.6 HSSF Serializer</h3> +<p> + The HSSF Serializer will be documented + by javadoc. + </p> +<a name="6.7+HSSF+Generator"></a> +<h3 class="boxed">6.7 HSSF Generator</h3> +<p> + The HSSF Generator will be documented + by javadoc. + </p> +<a name="6.8+HSSF+Serializer+Tag+language"></a> +<h3 class="boxed">6.8 HSSF Serializer Tag language</h3> +<p> + The XML tag language along with + function and usage shall be fully documented. Examples will be + provided as well. + </p> +</div> + +<a name="7.+Terminology"></a> +<h2 class="boxed">7. Terminology</h2> +<div class="section"> +<a name="7.1+Filesystem"></a> +<h3 class="boxed">7.1 Filesystem</h3> +<p> + filesystem shall refer only to the POI formatted archive. + </p> +<a name="7.2+File"></a> +<h3 class="boxed">7.2 File</h3> +<p> + file shall refer to the embedded data stream within a + POI filesystem. This will be the actual embedded document. + </p> +</div> + +<p align="right"> +<font size="-2">by Andrew C. Oliver, Marcus W. Johnson, Glen Stampoultzis, Nicola Ken Barozzi</font> +</p> +</div> +<!--+ + |end content + +--> +<div class="clearboth"> </div> +</div> +<div id="footer"> +<!--+ + |start bottomstrip + +--> +<div class="lastmodified"> +<script type="text/javascript"><!-- +document.write("Last Published: " + document.lastModified); +// --></script> +</div> +<div class="copyright"> + Copyright © + 2001-2018 <a href="https://www.apache.org/";>The Apache Software Foundation</a> +</div> +<div id="feedback"> + Send feedback about the website to: + <a id="feedbackto" href="mailto:[email protected]?subject=Feedback%C2%A0devel/plan/vision20.html";>[email protected]</a> +</div> +<!--+ + |end bottomstrip + +--> +</div> +</body> +</html> Added: poi/site/publish/devel/references/images/logoAdria1.png URL: http://svn.apache.org/viewvc/poi/site/publish/devel/references/images/logoAdria1.png?rev=1836244&view=auto ============================================================================== Binary file - no diff available. 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