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# Boolean and Proximity Search

You can use the `Query` action to submit standard Boolean queries to IDOL Server, and to submit proximity queries that allow you to give words that appear close together in the search string a higher weighting.

IDOL Server uses APCM (Adaptive Probabilistic Concept Modeling) to rank the results.

Note: You must specify all search operators in capital letters.

## Boolean Operators

You can apply the operators in the following table to words, exact phrases, or other Boolean expressions in your query.

`AND` | Binary operator. Both terms must match in every document that returns. For example:
    action=Query&Text=cat AND dog
This query returns only documents that contain both cat and dog.
`NOT` | Unary operator. Excludes the term that follows `NOT` from all the returned documents. For example:
    action=Query&Text=cat NOT dog
This query returns only documents that contain cat but not dog. Note: To use `NOT` to exclude multiple terms, you must use brackets. Otherwise, `NOT` applies only to the term that immediately follows it. To use `NOT` to exclude a phrase, you must put the phrase in quotation marks. For example: Document 1: I went to the city for the New Year Document 2: I went to New York City for the New Year The following query does not match either of the above documents:
    action=Query&Text=city NOT (New York)
The following queries match the first document but not the second:
    action=Query&Text=city NOT ("New York")
    action=Query&Text=city NOT "New York"
`OR` | Binary operator. One or both terms must appear for the document to return. This option is the default behavior if you do not specify an operator between two terms. For example:
    action=Query&Text=cat OR dog
This query returns documents that contain cat, dog, or both terms.
`EOR` or `XOR` | Binary operator. Logical exclusive `OR`. A document must contain only one of the terms for it to return. This operator is rarely used. For example:
    action=Query&Text=cat XOR dog
This query returns only documents that contain either the term cat or the term dog. Documents that contain both cat and dog do not return.
`()` | Bracketed expressions. IDOL Server evaluates brackets from left to right. You can nest bracketed expressions. Brackets dictate the precedence and behavior of combined operator statements. For example:
    action=Query&Text=(fish EOR pie) AND (chips EOR mash)
This query returns documents that contain one of the following combinations: fish and chips fish and mash pie and chips pie and mash

## Proximity Search Operators

You can apply the operators in the following table to words, exact phrases, or other Boolean expressions to run a proximity search.

Note: If the two specified words are adjacent to each other, their proximity is `1`, if one word separates them, their distance is `2` and so on.

The proximity ignores stop words (for example, because and is a stop word, the terms cat and dog have a proximity of `1` both in the text `cat dog` and `cat and dog`).

Note: Proximity operators work recursively so that nested Boolean queries can have proximity operators apply to brackets or phrases. For example, in the expression

    (term1) NEAR10 ((term2) DNEAR2 (term3))

the `NEAR10` operator ensures that `term1` is in proximity to an occurrence of `term2` within two of `term3`.

`NEARN` | Returns only documents in which the second term is within `N` words of the first term; that is, the terms are `N` or fewer words apart. If you do not specify `N`, `NEAR` defaults to `5`. For example:
    action=Query&Text=red NEAR1 green
This query returns only documents in which the term red is adjacent to the term green. Documents that contain `red green` or `green red` return. Documents that contain `red orange green` do not return (the terms are not close enough to each other).
`DNEARN` | Directed `NEAR`. Returns only documents in which the second term is within `N` words of the first term, in the specified order. If you do not specify `N`, `DNEAR` defaults to `5`. For example:
    action=Query&Text=red DNEAR2 green
This query returns only documents in which the term green follows the term red, and is no more than two words away from the term red. Documents that contain `red orange green` return. Documents that contain `green orange red` or `red orange blue green` do not return.
`WNEARN` | Weighted `NEAR` (with `OR` operation). Proximity operator that returns documents that contain either of the two terms. It promotes relevance when term spacing is less than the specified `N` word distance (closer together implies higher relevance). If you do not specify `N`, `WNEAR` defaults to `5`. For example:
    action=Query&Text=red WNEAR7 green
This query returns documents that contain the term red or the term green. It gives extra relevance to documents in which red and green appear seven or fewer words apart in a piece of text. This weight increases as the terms get closer to each other. Documents in which the terms occur more than seven words apart, or in which only one term occurs, return with the normal relevance.
`YNEARN` | Weighted `NEAR` (with `AND` operation). Proximity operator that returns documents that contain both of the terms. It promotes relevance when term spacing is less than the specified `N` word distance (closer together implies higher relevance). If you do not specify `N`, `YNEAR` defaults to `5`. For example:
    action=Query&Text=red YNEAR7 green
This query returns only documents that contain both the term red and the term green. Extra relevance is given to documents in which red and green appear seven or fewer words apart in a piece of text. This weight increases as the terms get closer to each other. Documents in which the terms occur more than seven words apart return with the normal relevance.
`BEFORE` | Returns only documents in which the first term precedes the second one. For example:
    action=Query&Text=red BEFORE green
This query returns only documents in which the term green appears later than the term red. Note: For a `FieldText` query with the `BEFORE` operator to successfully compare two occurrences of the same field, you must set the `XMLFullStructure` configuration parameter to `True` in the IDOL Server configuration file `[Server]` section.
`AFTER` | Returns only documents in which the first term appears later than the second one. For example:
    action=Query&Text=red AFTER green
This query returns only documents in which the term red appears later than the term green. Note: For a `FieldText` query with the `AFTER` operator to successfully compare two occurrences of the same field, you must set the `XMLFullStructure` configuration parameter to `True` in the IDOL Server configuration file `[Server]` section.
`XNEAR` | Returns only documents in which the second term is exactly `N` words from the first term. For example:
    action=Query&Text=cats+XNEAR2+dogs
This query returns only documents in which the term dogs follows the term cats and is exactly two words away from the term cats. Documents that contain, for example, `cats scare dogs` return, while documents that contain `dogs eat cats` or `cats, dogs` do not return. This operator is available only for the `Text` action parameter.
`SENTENCE` | Returns only documents in which the second term is in the same sentence as the first term. For example:
    action=Query&Text=cats+SENTENCE+dogs
This query returns only documents in which the term dogs occurs in the same sentence as the word cats.
`SENTENCENN` | Returns only documents in which the second term is in the same sentence as the first term, and they are within `NN` words of each other. For example:
    action=Query&Text=cats+SENTENCE10+dogs
This query returns only documents in which the term dogs occurs in the same sentence as, and within 10 words of, the word cats. Note: `SENTENCE0` has the same behavior as `SENTENCE`.
`DSENTENCE` | Returns only documents in which the second term occurs later than the first term, in the same sentence. For example:
    action=Query&Text=cats+DSENTENCE+dogs
This query returns only documents in which the term dogs occurs later in the same sentence than the word cats.
`DSENTENCENN` | Returns only documents in which the second term occurs later than the first term, and within `NN` words in the same sentence. For example:
    action=Query&Text=cats+DSENTENCE10+dogs
This query returns only documents in which the term dogs occurs later in the same sentence as, and within 10 words of, the word cats. Note: `DSENTENCE0` has the same behavior as `DSENTENCE`.
`PARAGRAPH` | Returns only documents in which the second term is in the same paragraph as the first term. For example:
    action=Query&Text=red+PARAGRAPH+green
This query returns only documents in which the term green occurs in the same paragraph as the word red. The words do not have to occur in the same sentence in the paragraph.
`PARAGRAPHNN` | Returns only documents in which the second term is in the same paragraph as the first term, and they are within `NN` words of each other. For example:
    action=Query&Text=cats+PARAGRAPH20+dogs
This query returns only documents in which the term dogs occurs in the same paragraph as, and within 20 words of, the word cats. Note: `PARAGRAPH0` has the same behavior as `PARAGRAPH`.

## Other Search Operators

If you set `XMLFullStructure` to `True` in the `[Server]` section of the IDOL Server configuration file, you can use the following operators in `Text` and `FieldText` queries to return XML documents in which fields or attributes occur together, or do not occur together.

`WHEN` | Return only XML documents in which two fields that have the same parent field contain specified terms or phrases.
`WHENN` | Return only XML documents in which two fields that have the same parent field at `N` levels from the root level contain specified terms or phrases.
`NOTWHEN` | Return only XML documents in which the first field and value pair occurs, but the second field and value does not occur in the same parent field.

Examples

Consider the following three XML documents:

Document 1:
    <DOC>
       <car>
          <make>audi</make>
          <color>red</color>
       </car>
       <car>
          <make>mercedes</make>
          <color>silver</color>
       </car>
    </DOC>
Document 2:
    <DOC>
       <car>
          <make>audi</make>
          <color>silver</color>
       </car>
       <car>
          <make>mercedes</make>
          <color>red</color>
       </car>
    </DOC>
Document 3:
    <DOC>
       <car>
          <make>audi</make>
          <body>
             <color>red</color>
          </body>
       </car>
       <car>
          <make>mercedes</make>
          <body>
             <color>silver</color>
          </body>
       </car>
    </DOC>

- The following query returns only XML documents in which the `make` and `color` fields are direct children of the same parent field, and contain the values `audi` (in the `make` field) and `red` (in the `color` field).

      action=Query&Text=audi:make+WHEN+red:color

  This query returns Document 1, but not Document 2 or Document 3.

- The following query returns only XML documents in which the `make` field contains the value `audi`, and the `color` field contains the value `red`, within a parent field that is two levels from the root field.

      action=Query&Text=audi:make+WHEN2+red:color

  This query returns Document 1 and Document 3, but not Document 2.

- The following query returns only XML documents in which the `make` field contains the value `audi`, under a parent field that does not also have a `color` field with the value `red`.

      action=Query&Text=audi:make+NOTWHEN+red:color

  This query returns Document 2 and Document 3, but not Document 1.

Nested Expressions

You can use complex nested expressions with the `WHEN` and `NOTWHEN` operators in query text. For example:

    action=Query&Text=(London:CITY WHEN English:LANG) WHEN ("United Kingdom":COUNTRY)

    action=Query&Text=(Lincoln:CITY NOTWHEN Nebraska:STATE) NOTWHEN ("United Kingdom":COUNTRY)

Field Attributes

You can use `WHEN` and `NOTWHEN` to return only XML documents in which two attributes that occur in the same field contain (or do not contain) specified terms or phrases.

For example:

- The following query returns only XML documents in which the `LANG` and `CAPITAL` attributes occur in the same field, and contain the values `English` (in the `LANG` attribute) and `Cape Town` (in the `CAPITAL` attribute).

      action=Query&Text=English:_ATTR_LANG WHEN "Cape Town":_ATTR_CAPITAL

  This query returns a document that contains the following field:

      <COUNTRY CAPITAL="Cape Town" LANG="English" POP="44">South Africa</COUNTRY>

  The following field does not match the query:

      <COUNTRY CAPITAL="Cape Town" LANG="Afrikaans" POP="10">South Africa</COUNTRY>

- The following query returns only XML documents in which the `LANG` attribute contains the value `English` in a field where the `COUNTRY` attribute does not contain the value `UK`.

      action=Query&Text=English:_ATTR_LANG NOTWHEN London:_ATTR_CAPITAL

  This query returns a document that contains the following field:

      <COUNTRY CAPITAL="Canberra" LANG="English" POP="44">Australia</COUNTRY>

  It does not match the following field:

      <COUNTRY CAPITAL="London" LANG="English" POP="44">United Kingdom</COUNTRY>

You can also use `WHEN` and `NOTWHEN` to return only XML documents in which a field contains a specified term or phrase, and has an attribute that has a specific value.

For example:

    action=Query&Text=Fr.html:_ATTR_HREF WHEN France:A

This query returns only XML documents in which the `A` field contains the value `France`, and has an `HREF` attribute with the value `Fr.html`.

The following document, for example, returns in this query:

    <XML>
       <DOC>
          <A HREF="Fr.html">France</A>
       </DOC>
    </XML>

The following document does not return:

    <XML>
       <DOC>
          <A HREF="France.html">France</A> is next to <A HREF="Fr.html">Belgium</A>
       </DOC>
    </XML>

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