Workbook Part
| Content Type(s): | application/vnd.openxmlformats-officedocument.spreadsheetml.main+xmlapplication/vnd.openxmlformats-officedocument.spreadsheetml.template.main+xml | 
| Root Namespace: | http://schemas.openxmlformats.org/spreadsheetml/2006/main | 
| Source Relationship: | http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument | 
An instance of this part type contains workbook data and references to all of its worksheets.
A package shall contain exactly one Workbook part, and that part shall be the target of a relationship in the package-relationship item.
<Relationships xmlns="…"> <Relationship Id="rId1" Type="http://…/officeDocument" Target="xl/workbook.xml"/> </Relationships>
The root element for a part of this content type shall be< workbook>.
<workbook xmlns="…" xmlns:r="…"> <fileVersion lastEdited="4" lowestEdited="4" rupBuild="3417"/> <bookViews> <workbookView xWindow="240" yWindow="15" windowWidth="8505" windowHeight="6240"/> </bookViews> <sheets> <sheet name="January" tabId="1" r:id="rId1"/> <sheet name="February" tabId="2" r:id="rId2"/> <sheet name="March" tabId="3" r:id="rId3"/> </sheets> <workbookPr showObjects="all"/> <webPublishing codePage="1252"/> <calcPr calcId="122211" fullCalcOnLoad="1"/> </workbook>
A Workbook part shall be located within the package containing the source relationship (expressed syntactically, the @TargetMode attribute of the <Relationship> element shall be Internal).
A Workbook part is permitted to have implicit relationships to the following parts defined by this Standard:
- Additional Characteristics (§15.2.1) 
- Bibliography (§15.2.3) 
- Calculation Chain (§12.3.1) 
- Cell Metadata (§12.3.10) 
- Connections (§12.3.4) 
- Custom XML Mappings (§12.3.6) 
- Custom XML Data Storage (§15.2.4) 
- Shared String Table (§12.3.15) 
- Shared Workbook Revision Headers (§12.3.16) 
- Shared Workbook User Data (§12.3.18) 
- Styles (§12.3.20) 
- Theme (§14.2.7) 
- Thumbnail (§15.2.14) 
- Volatile Dependencies (§12.3.22) 
A Workbook part is permitted to have explicit relationships to the following parts defined by this Standard:
- Chartsheet (§12.3.2) 
- Dialogsheet (§12.3.7) 
- External Workbook References (§12.3.8) 
- Pivot Table Cache Definition (§12.3.12) 
- Worksheet (§12.3.24) 
A Workbook part shall not have implicit or explicit relationships to any other part defined by this Standard.