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DiffGram Format Annotations Another remarkable difference between the ADO.NET XML normal form and the DiffGram's data instance is that the latter includes extra attributes such as id, hasChanges, hasErrors, and rowOrder. The extra attributes come from a couple of custom namespaces that are referenced at the beginning of the DiffGram. These special attributes are used to flag nodes, thus relating elements across the various sections data instance, changes, and errors. Table 10-1 lists all the DiffGram special attributes, also commonly referred to as annotations. Table 10-1: DiffGram Annotations Attribute Description diffgr:error Contains the text that describes the error for the row or a column on the row. diffgr:hasChanges Indicates that the row has been modified or inserted. diffgr:hasErrors diffgr:id diffgr:parentId msdata:hiddenXXX msdata:rowOrder Indicates that the row contains an error. Returns the unique ID used to couple rows across sections. Returns the unique ID for the parent row. Replacement attribute for columns marked as hidden. XXX denotes the actual name of the column. Tracks the ordinal position of the row in the DataSet object.

There's no special reason for annotations to come from different namespaces it's just a more rational categorization. Attributes in the diffgr namespace relate elements from 365

The Office PivotChart Web Part, shown in Figure 9-10, converts tabular data to graphical. The available features closely resemble Excel s Chart Wizard, but the PivotChart Web Part isn t nearly as intuitive or easy to use. When you connect the data sources, the web part automatically creates a chart based on the data. However, it might be a long way from the chart you want to see. First of all, the PivotChart Web Part cannot chart noncontiguous data. To chart data that isn t contiguous, you need to rearrange the original data source to make the columns or rows you want to chart contiguous.

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If you switch to Print Layout view, you will notice that the table of contents is on the same page as the outline. You will want to insert a page break between the table of contents and the rest of the business plan. To insert a page break, position the cursor at the end of the table of contents. Click Insert Break. In the Break dialog box, shown in Figure 2-6, select Page break and click OK. This ensures that the business plan will begin on a new page. The break will not appear in Outline view.

different blocks Attributes in the msdata namespace represent working information that is useful to know when you're processing the DiffGram Cross-Section Links Each row rendered in a DiffGram is given a unique ID The ID is automatically generated and consists of the table name followed by a one-based index for example, Employees1, Employees2, and so on The diffgr:id attribute is used as a key to retrieve the original data and the errors of a row from the <diffgr:before> and <diffgr:errors> sections The following DiffGram contains a modified row: <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1"> <NorthwindInfo> <Employees diffgr:id="Employees1" msdata:rowOrder="0" diffgr:hasChanges="modified" employeeid="1" lastname="Davolio" firstname="Michela" /> .. </NorthwindInfo> <diffgr:before> <Employees diffgr:id="Employees1" msdata:rowOrder="0" employeeid="1" lastname="Davolio" firstname="Nancy" /> .</diffgr:before> </diffgr:diffgram> The same row can be referenced in any, or even all, of the DiffGram blocks If the row is currently part of the DataSet object, you will find it in the data instance block.

If the row has been updated or deleted, it will have a corresponding entry in the <diffgr:before> section If error messages have been associated with any of the row's columns, another record will be found in the <diffgr:errors> section The diffgr:id attribute is used to pair related elements The msdata:rowOrder attribute is a simple zero-based index that tracks the ordinal position of the row in the source DataSet object This information is not updated when a row is deleted An msdata:rowOrder value of 1 indicates that the row was the second in the table when the DiffGram was created Catching Changes in the Data The diffgr:hasChanges attribute indicates the type of change that has occurred in the row This attribute can take any of the values listed in Table 10-2.

If the data source is a Spreadsheet Web Part, you can easily identify the data you want to chart from Tip

Table 10-2: Values for the diffgr:hasChanges Attribute Value Description descent Indicates that the row received has one or more children from a parent/child relationship that have been modified inserted Indicates that the row has been added modified Indicates that the row has been modified The original values are stored in the corresponding row in the <diffgr:before> section 366.

the data source itself. To modify the data range displayed in the PivotChart Web Part, select the data you want to chart in the Spreadsheet Web Part, then click the down arrow on the data source s title bar. Choose Set Chart Range to establish a new data range for the chart. Using these two web parts together, you can create a nifty reporting interface for your users.

An added row has no corresponding element in the <diffgr:before> section. A deleted row has no corresponding element in the data instance block, but there will be an entry in the <diffgr:before> block. Looking at the data instance, you can quickly and easily identify the modified and added rows each has a diffgr:hasChanges attribute set to a self-explanatory value. But what about deleted rows By design, any hole in the sequence of msdata:rowOrder values denotes a deleted row. The msdata:rowOrder values must necessarily be consecutive. Let's look more closely at how a DiffGram is actually loaded in memory and transformed into a DataSet object. Reading Back DiffGrams When reading a DiffGram, the DataSet object's ReadXml method first loads the data instance and creates all the necessary tables and rows. Each row is put in the added or modified state, as appropriate. All the diffgr:id values are temporarily copied into an internal hash table defined as a property of the DataSet object. Each entry in the hash table references a DataRow object in the table being created. Next ReadXml processes the <diffgr:before> section and reads the old values for the available rows. If a match can be found between a row in the <diffgr:before> section and a row already loaded in the table, the just-read values are stored as the original values of the table row. ReadXml looks for a match between the diffgr:id attribute in the <diffgr:before> section and the contents of the hash table. Figure 10-2 shows how the DataSet object is built.

As you work on the business plan, Word may not update the page numbers or headings in the table of contents. This is normal. Word will make the appropriate changes when you print the document. If it is important to you that the table of contents be updated as you work, you can tell Word to update it. On the Outlining toolbar, click Update TOC. The Update Table of Contents dialog box appears, as shown in Figure 2-7.

Figure 10-2: The DataSet is built by reading the DiffGram sections one after the next and using the row IDs to pair elements in the various blocks.

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