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When you open such a file, you will notice that all of the sheet data is inside the element. For every worksheet, there is a separate XML file " sheet1.xml", " sheet2.xml", and so on. We just want to write / read worksheet data, so we need to look in the folder " \xl\worksheets" inside the XLSX file where all the worksheets are located. Reference schemas for all XML files used in Office can be downloaded from MSDN, but note that some things are still open to change until the final Excel 2007 release. Excel 2007 Open XML specificsĮxcel 2007 extends on the basis of Open Packaging Conventions by adding its own application-specific XML types.

The whole story about packages, parts, content types, and relations is the same for all Open XML documents (regardless of the originating application), and Microsoft refers to it as Open Packaging Conventions.

MICROSOFT PROJECT ON MICROSOFT OFFICE 2007 ZIP FILE

Package everything into a Zip file with the appropriate extension (DOCX, XLSX, or PPTX) - any standard Zip library will do.Create content types - create a ".xml" file.Create/get all the necessary parts - by using some standard XML library (if they are XML), by copying them, or by using some other method.

On the other side, if you want to create a new Open XML file, you need to: Read parts you are interested in - using the standard XML library (if they are XML), or some other method (if they are images, sounds, or some other type).Find parts that contain data you want to read - you can navigate through a relationship graph (more complex), or you can presume that certain parts have a defined name and path (Microsoft can change that in the future).

MICROSOFT PROJECT ON MICROSOFT OFFICE 2007 ARCHIVE

Open package as a Zip archive - any standard Zip library will do.

To cut a long story short, in order to read the data from an Open XML file, you need to: Picture 1: Parts and relations inside an XLSX file. There is also a start part (sometimes called "root", which is a bit misleading because the graph containing all parts doesn't have to be a tree structure), so the entire structure looks like in picture 1. rels" extension which define the relationship between the parts. Inside the package are special XML files with a ". Every part must be connected to some other part using a relationship. The content type can describe anything application XML, user XML, images, sounds, video, or any other binary object. It is important to know that every part has a defined content type and there are no default type presumptions based on the file extension. Files inside that package are called parts. In Microsoft's terminology, an Open XML Zip file is called a package.

Files are smaller as a result of compression and native multimedia storage.

Images and multimedia are now encoded in native format, not as text streams.

You don't need to process the entire file in order to extract specific data.

Although more complex, the new approach offers a few benefits: This is in direct contrast with the old WordML and SpreadsheetML formats which were single, non-compressed XML files.

Office-specific data is stored in multiple XML files inside that archive. Microsoft Open XML formatĮvery Open XML file is essentially a Zip archive containing many other files. The created XLSX files can be opened using Excel 2007 or greater. The application is written in C# using Visual Studio 2010. Presented is a demo application which writes / reads tabular data to / from XLSX files. This article will explain the basics of the Open XML file format, and specifically the XLSX format, the new format for Excel 2007. Since the new formats will be default in Office 2007 and Microsoft Office is the most predominant Office suite, these formats are destined to be popular and you will probably have to deal with them sooner or later. The new formats share some similarities with the old Office XML formats (WordML, SpreadsheetML) and some similarities with the competing OpenDocument format, but there are many differences. With Office 2007, Microsoft decided to change the default application formats from old, proprietary, closed formats (DOC, XLS, PPT) to new, open, and standardized XML formats (DOCX, XLSX, and PPTX).

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Download demo project and source files - 192 KB.