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Introduction to Excel XML

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Blog Tales: Introduction to Excel XML

We were unable to locate this content in zh-cn.
Here is the same content in en-us.

Blog Tales
Introduction to Excel XML
Brian Jones

With the soon-to-be released
next version of Microsoft®
Office (currently code-named "Office 12"), there will be new default file formats for Microsoft Word, PowerPoint®
, and Excel®
.
These new formats, called the Microsoft Office Open XML Formats, will
open up a whole new world to Office developers. By default, Office
documents will be open and accessible, as they will use standard ZIP and
XML technologies with full documentation made available under a
royalty-free license. These technologies are an improvement on the
existing XML formats that shipped with Microsoft Office 2003 Editions,
but those existing Office 2003 XML Reference Schemas can be used today
to implement solutions that work with the document data and they provide
a great way to gain an understanding of what developing with the new
default formats will entail.
The
SpreadsheetML format in Microsoft Excel is fairly easy to work with, as
it was designed especially to be human readable and editable. But many
of you probably haven’t had a chance to take a look at the XML support
in Excel. Once you get a handle on how it works, though, you’ll realize
you have plenty of uses for the XML features, from converting data
between databases and Web pages to sharing files among disparate
applications.
To
get you started, I’ll build a sample in XML that will illustrate how it
all works. As you follow along, you can use Office XP or Office 2003
for this example since both support SpreadsheetML in their versions of
Excel. Using a text editor, I’m going to create a very simple table that
looks like Figure 1
, outlining seven steps to create an XML file that represents an Excel worksheet.

Figure 1 The Table Example

First Name	Last Name	Phone Number
Nancy	Davolio	(206) 555-9857
Andrew	Fuller	(206) 555-9482
Janet	Leverling	(206) 555-3412
Margaret	Peacock	(206) 555-8122
Steven	Buchanan	(71) 555-4848

1. Create the XML File
To begin, create a new file in Notepad, and call it test.xml. Then follow the steps outlined here. First type the following:

<?xml version="1.0"?>

This declares that the file is an XML document adhering to the 1.0
version of the XML spec. It should always be found at the top of all
your XML files. Next add the root element for the document. XML files
always have one and only one root element that contains the rest of the
document. For SpreadsheetML, the root element is <Workbook>. After
the XML declaration, add that element so that your file now looks like
this:

   <?xml version="1.0"?><Workbook>
</Workbook>

2. Declare the Namespace
Now
you’ll declare the namespace and add a prefix to the root element. Most
XML documents have a namespace associated with them. Declaring the
namespace of an XML file makes it a lot easier for users parsing your
XML to know what type of XML they are dealing with. Even in Office there
are a number of different uses for XML. One way to know when you are
parsing a Word XML file as opposed to an Excel XML file, for example, is
to look at the namespace. With Office XP, when the product group
created the SpreadsheetML schema, we were still using namespaces in the
form "urn:schemas-microsoft-com:office". Going forward, we’ll use URL
namespaces, as we did with WordML in Office 2003
(//schemas.microsoft.com/office, for example). By adding the namespace
declaration to the spreadsheet, your file should look like this:

<?xml version="1.0"?><Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet">
</Workbook>

The
last thing you’ll do for the namespace is use a prefix, rather than the
default. Since the attributes are qualified for the SpreadsheetML
schema, you need to do this if you are going to use any attributes.
Let’s use "ss" (for spreadsheet) as the prefix. You’ll add "ss:" in
front of all of your elements, and you’ll update your namespace
declaration to say that the namespace applies to everything with an
"ss:" in front of it, instead of just applying to the default XML
elements, as shown here:

<?xml version="1.0"?><ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
</ss:Workbook>

Notice
that the namespace declaration says xmlns:ss= instead of just xmlns=.
This means that anything with an "ss:" in front of it applies to the
spreadsheet namespace.

3. Add a Worksheet
Next
you’ll add a worksheet. Since you have an empty workbook, you need to
declare the spreadsheet grid within the workbook. As you may know,
workbooks can have multiple worksheets, but here you’ll just declare
one. In addition, let’s declare a table inside the worksheet. The table
is where all the grid data will go, and the file will now look like
this:

<?xml version="1.0"?><ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
<ss:Worksheet ss:
Name="Sheet1">
<ss:Table>
</ss:Table>
</ss:Worksheet>
</ss:Workbook>

4. Add the Header Row
The
first row in the table you want to generate has "First Name", "Last
Name", and "Phone Number" in the three columns. Let’s add a <Row>
tag as well as three <Cell> tags. The actual content of the cell
is contained within a <Data> tag, so let’s add that as well. The
file now looks like Figure 2
.

Figure 2 XML Worksheet Takes Form

<?xml version="1.0"?><ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
<ss:Worksheet ss:Name="Sheet1">
<ss:Table>
<ss:Row>
<ss:Cell>
<ss:Data ss:Type="String">First Name</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Last Name</ss:Data>
</ss:Cell>
<ss:Cell><ss:Data ss:Type="String">Phone Number</ss:Data>
</ss:Cell>
</ss:Row>
</ss:Table>
</ss:Worksheet>
</ss:Workbook>

You now have a template for the table that you can open directly in Excel. It will look like Figure 3
. Not too exciting, but it’s a start.

Figure 3 Rudimentary Worksheet

5. Adjust the Column Widths
Notice
that the widths of the columns are too narrow for the content. Let’s
add some XML to the file to specify the width you want for the columns.
The resulting code is shown in Figure 4
.

Figure 4 Resizing the Columns

<?xml version="1.0"?><ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
<ss:Worksheet ss:Name="Sheet1">
<ss:Table>
<ss:Row>
<ss:Cell>
<ss:Data ss:Type="String">First Name</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Last Name</ss:Data>
</ss:Cell>
<ss:Cell><ss:Data ss:Type="String">Phone Number</ss:Data>
</ss:Cell>
</ss:Row>
</ss:Table>
</ss:Worksheet>
</ss:Workbook>

Now open the file again in Excel. Notice that the columns are wider and that the text now fits (see Figure 5
).
There is another attribute you can set on the column element that tells
it to use autofit for the widths. This only works for numbers and dates
though. Since your cells are strings, you need to explicitly set the
width.

Figure 5 Resized Cells

6. Add the Remaining Data
Now
add those additional rows of data. This should be pretty easy. Just
select that first "row" element and copy it. Then paste it five more
times so you have six total rows. Now go through and update the values
of the rows. If you are familiar with Extensible Stylesheet Language
Transform (XSLT), you’ll see how you could easily generate an XSLT that
could be applied to a DataSet to transform it into SpreadsheetML. Just
repeat the Row tag for each row in your DataSet and add the values in
each cell’s Data tag. After applying all the data, your XML should look
like Figure 6
, which has been abbreviated for space. Figure 7
shows the full table in Excel.

Figure 6 XML Table with all Data

<?xml version="1.0"?><ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
<ss:Worksheet ss:Name="Sheet1">
<ss:Table>
<ss:Column ss:Width="80"/>
<ss:Column ss:Width="80"/>
<ss:Column ss:Width="80"/>
<ss:Row>
<ss:Cell>
<ss:Data ss:Type="String">First Name</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Last Name</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Phone Number</ss:Data>
</ss:Cell>
</ss:Row>
<ss:Row>
<ss:Cell>
<ss:Data ss:Type="String">Nancy</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Davolio</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">(206)555 9857</ss:Data>
</ss:Cell>
</ss:Row>
<ss:Row>
...
</ss:Row>
</ss:Table>
</ss:Worksheet>
</ss:Workbook>

Figure 7 Worksheet with Data

7. Add Header Formatting
As
you can see, the first row does not look like a column header, so let’s
format it with bold text so that it’s clearly the header. All you need
to do is generate a style that has bold text, and then reference that
style with the first row. First, add the following XML in front of the
Worksheet tag:

<ss:Styles>
<ss:Style ss:ID="1">
<ss:Font ss:Bold="1"/>
</ss:Style>
</ss:Styles>

This creates a style whose ID is "1" and has bold applied to it. Next,
update the first row element to reference StyleID 1. The row code should
now look like this:

<ss:Row ss:SyleID="1">

Your XML should now look like Figure 8
, and Figure 9
shows how it looks in Excel.

Figure 8 Bolding the Header Row

<?xml version="1.0"?><ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet">
<ss:Styles>
<ss:Style ss:ID="1">
<ss:Font ss:Bold="1"/>
</ss:Style>
</ss:Styles><ss:Worksheet ss:Name="Sheet1">
<ss:Table>
<ss:Column ss:Width="80"/>
<ss:Column ss:Width="80"/>
<ss:Column ss:Width="80"/>
<ss:Row ss:StyleID="1">
<ss:Cell>
<ss:Data ss:Type="String">First Name</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Last Name</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Phone Number</ss:Data>
</ss:Cell>
</ss:Row>
<ss:Row>
<ss:Cell>
<ss:Data ss:Type="String">Nancy</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">Davolio</ss:Data>
</ss:Cell>
<ss:Cell>
<ss:Data ss:Type="String">(206)555-9857</ss:Data>
</ss:Cell>
</ss:Row>
...
</ss:Row>
</ss:Table>
</ss:Worksheet>
</ss:Workbook>

Figure 9 The Completed Worksheet

Wrap-Up
That
was a pretty simple example, but it’s a good introduction if you’re new
to Office XML (or even new to XML in general). The new XML formats for
future versions of Excel will look different than what I’ve shown you
with SpreadsheetML, but there will also be some similarities. It’s good
to become familiar with the existing schemas, and I’ll start posting a
lot more about the new schemas on my blog at blogs.msdn.com/brian_jones
.

Blog Tales Resources
Are
you looking to get a jump on becoming an Office Open XML Formats
expert? Or are you just curious about how the changes in the next
version of Microsoft Office will impact your environment? Check out
these sites for more information.

XML in Office Development

Whether
you’re just getting up to speed with XML or you’ve been making use of
XML support in Microsoft Office since the release of Office 2003, there
is always more to learn. The Office Developer Center has an excellent
section dedicated to XML in Office Development. Here you’ll find
tutorials, code samples, reference documentation, and useful tools.

XML in Office Technical Articles

Looking
for some not-so-light reading about XML? Check out this collection of
in-depth articles on using XML to improve how your organization works.

Jensen Harris: An Office User Interface Blog

While
changes to XML in Microsoft Office are buried beneath the surface, the
new user interfaces found in familiar apps like Microsoft Excel and Word
are a bit more readily evident. Jensen Harris, a member of the
Microsoft Office user experience team, keeps a blog where he discuss the
new UI designs in Office applications and explains why these changes
were made.

Brian Jones
is a program manager at Microsoft working on XML functionality and file
formats in Office. Most recently, Brian has worked on the Microsoft
Office Open XML Formats that will be introduced in Office 12. This
column was adapted from his blog, which can be found at blogs.msdn.com/brian_jones
.

© 2008
Microsoft Corporation and CMP Media, LLC. All rights reserved;
reproduction in part or in whole without permission is prohibited
.

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