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[ms-wsp]: Windows Search Protocol Intellectual Property Rights Notice for Open Specifications Documentation
| | bet | 12/28 | | Sana | 25.03.2020 | | Hajmi | 349,46 Kb. | | #8793 |
CCoercionRestriction
The CCoercionRestriction structure contains the modifier and rank coercion operation.
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_flValue
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_childRes (variable)
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_flValue (4 bytes): An IEEE 32-bit floating point number [IEEE754] representing the coercion value upon which the rank coercion operation happens. Note that the coercion operation is determined by the containing CRestriction structure. The following coercion operations are supported.
Operation
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Meaning
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ADD
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The rank value returned is the sum of the original rank value and the coercion value.
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MULTIPLY
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The rank value returned is the product of the original rank value and the coercion value and MUST be in the range 0.001 to 1.0.
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ABSOLUTE
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The rank value returned is the value specified in the coercion value and MUST be in the range 0 to 1000.
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_childRes (variable): CRestriction structure that specifies a command tree. The returned rank value for results of a child restriction will be coerced as specified by the containing CRestriction structure.
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CRelDocRestriction
A CRelDocRestriction structure contains a relevant document ID.
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_vDocument (variable)
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_vDocument (variable): A CBaseStorageVariant structure that specifies a relevant document for a relevance feedback query. The vType field of the _vDocument structure MUST be set to either VT_I4 or to VT_BSTR, specifying a URL string.
If vType is set to VT_I4, then vValue MUST be set to the document ID.
If vType is set to VT_BSTR, the URL string MUST be formatted by concatenating a constant string containing the docId protocol, the application, and the catalog name with the document ID in decimal representation, as in the following example.
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docid:Windows.SystemIndex.153
In the example, "Windows" is the application name, "SystemIndex" is the catalog name, and "153" is the document ID for the document in decimal notation.<3>
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CProbRestriction
A CProbRestriction structure contains parameters for probabilistic ranking.
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_Property (variable)
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_flK1
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_flK2
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_flK3
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_flB
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_cFeedbackDoc
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_ProbQueryPid
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_Property (variable): A CFullPropSpec structure, indicating which property to use for probabilistic ranking or the columns' group full property specification (which corresponds to _groupPid field in the CColumnGroup structure). In the latter case, CFullPropSpec MUST have the _guidPropSet field set to zero, the ulKind field set to PRSPEC_LPWSTR and the Property Name field set to the name of the referenced group property.
_flK1 (4 bytes): An IEEE 32-bit floating point number [IEEE754] that indicates parameter k1 in formula [1], specified below.
_flK2 (4 bytes): An IEEE 32-bit floating point number.
Note MUST be set to 0.0.
_flK3 (4 bytes): An IEEE 32-bit floating point number that indicates parameter k3 in formula [1].
_flB (4 bytes): An IEEE 32-bit floating point number that indicates parameter b in formula [1] below.
_cFeedbackDoc (4 bytes): A 32-bit unsigned integer specifying the count of relevant documents.
_ProbQueryPid (4 bytes): A 32-bit unsigned integer.
Note Reserved. MUST be set to 0x00000000.
Formula [1] for probabilistic ranking is the following sum for each query term:
Figure 1: Linear equation for probabilistic ranking restrictions in search request
Where:
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wtf (weighted term frequency) is the sum of term frequencies (the number of times a term occurs in a document) of a given term multiplied by weights across all properties.
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dl is the document length, in terms of number of all words (including noise words).
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avdl is the average document length in the corpus, in terms of number of words (including noise words).
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N is the total number of documents in the corpus.
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n is the number of documents in the corpus that have the given query term.
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qtf is the number of documents containing the given query term; the sum is across all query terms.
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k1, k3, and b are parameters, specified in the CProbRestriction structure.
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