# 605-07 : EDGAR Filer Manual v57 6.5.7 page 6-9

Created by: SEC Office of Structured Disclosure

## An instance must not contain duplicate xbrli:context elements.

An instance must not contain equivalent xbrli:context elements. xbrli:segment elements are tested for equality of their children without regard to order. Contexts are defined to be equivalent if they have S-equal identifiers, equal dateUnion values for startDate, endDate and instant (respectively), and segment element children with equal QNames for each explicit dimension (the scenario element is disallowed by another rule).

The id attribute of an xbrli:context element can be any xsd:NCName, but users will find it helpful when it is a mnemonic string that contains the xbrli:period (or fiscal period), and the local part of the QName contents of the dimension attribute and xbrldi:explicitMember. There is usually no need to repeat the registrant name in the id attribute. There is no limit on the length of the id attribute.

The table shows examples of this usage.

Period | xbrli:context id attribute
--- | ---
12 months of fiscal 2007 | FY07d
End of fiscal 2007 | FY07e
Start of fiscal 2007 | FY06e
3 months of the 2nd Quarter of fiscal 2007 | FY07Q2d
End of the 2nd Quarter of fiscal 2007 | FY07Q2e
9 months year to date in fiscal 2007 | FY07M9d
Fiscal 2006 previously reported amounts | FY06d_ScenarioAxis_PreviouslyReportedMember

### References

10992

## Variations

Number | Name | Description | References | Data Inputs | Result Outputs
--- | --- | --- | --- | --- | ---
- _001ng | 6.5.7, Duplicate contexts with differently ordered xbrldi:explicitMembers, NOGOOD | 6.5.7, An instance having two contexts with differently ordered xbrldi:explicitMember elements, they are duplicates, NOGOOD | 10992 |
  Parameter
  Name | ELOparams
  Type |
  Value | { "periodOfReport" : "12-31-2008", "emergingGrowthCompanyFlag" : false, "submissionType" : "8-K" }
- Instance e60507001ng-20081231.xml ReadMeFirst Linkbase e60507001ng-20081231_pre.xml Linkbase e60507001ng-20081231_def.xml Linkbase e60507001ng-20081231_lab.xml Schema e60507001ng-20081231.xsd |
  Assertion
  ID: err, 60507, Duplicate-Contexts
  FRD: | du
  Count satisfied | 0
  Count not satisfied | 1
- _002ng | 6.5.7, Duplicate contexts with differently ordered xbrldi:explicitMembers, NOGOOD | 6.5.7, An instance having two contexts with differently ordered xbrldi:explicitMember elements, they are duplicates, NOGOOD | 10992 |
  Parameter
  Name | ELOparams
  Type |
  Value | { "periodOfReport" : "12-31-2008", "emergingGrowthCompanyFlag" : false, "submissionType" : "8-K" }
- Instance e60507002ng-20081231.xml ReadMeFirst Linkbase e60507002ng-20081231_pre.xml Linkbase e60507002ng-20081231_def.xml Linkbase e60507002ng-20081231_lab.xml Schema e60507002ng-20081231.xsd |
  Assertion
  ID: err, 60507, Duplicate-Contexts
  FRD: | du
  Count satisfied | 0
  Count not satisfied | 1