API Guide

Overview

The Calais web service allows you to automatically annotate your content with rich semantic metadata, including Entities like People and Companies and Events & Facts like Acquisitions and Management Changes.

The following sections describe all aspects of the Calais web service. If you have any questions, please drop us a note.

API Calls

Call Format

The Calais web service supports SOAP- and POST-based calls.

The API call is as follows:

string Enlighten(string licenseID, string  content, string paramsXML)
Field Name Type Definition Notes
licenseID string API access key Obtained through registration
content string Content to be annotated Max input length is 100,000 characters
paramsXML string Processing and user directives and external metadata (see next topic - Input Parameters) Max parameters length is 16,000 characters

The wsdl can be found under http://api.opencalais.com/enlighten/?wsdl.

Visit the gallery and download our Calais sample client - it includes sample code for your reference.

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Example - SOAP 1.1

The following is a sample SOAP 1.1 request and response. The placeholders shown need to be replaced with actual values. 

POST /enlighten/calais.asmx HTTP/1.1
Host: api.opencalais.com
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://clearforest.com/Enlighten"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Enlighten xmlns="http://clearforest.com/">
      <licenseID>string</licenseID>
      <content>string</content>
      <paramsXML>string</paramsXML>
    </Enlighten>
  </soap:Body>
</soap:Envelope>

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <EnlightenResponse xmlns="http://clearforest.com/">
      <EnlightenResult>string</EnlightenResult>
    </EnlightenResponse>
  </soap:Body>
</soap:Envelope>

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Example - SOAP 1.2

The following is a sample SOAP 1.2 request and response. The placeholders shown need to be replaced with actual values.

POST /enlighten/calais.asmx HTTP/1.1
Host: api.opencalais.com
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <Enlighten xmlns="http://clearforest.com/">
      <licenseID>string</licenseID>
      <content>string</content>
      <paramsXML>string</paramsXML>
    </Enlighten>
  </soap12:Body>
</soap12:Envelope>

HTTP/1.1 200 OK
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <EnlightenResponse xmlns="http://clearforest.com/">
      <EnlightenResult>string</EnlightenResult>
    </EnlightenResponse>
  </soap12:Body>
</soap12:Envelope>

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Example - HTTP POST

The following is a sample HTTP POST request and response. The placeholders shown need to be replaced with actual values.

POST /enlighten/calais.asmx/Enlighten HTTP/1.1
Host: api.opencalais.com
Content-Type: application/x-www-form-urlencoded
Content-Length: length

licenseID=string&content=string&paramsXML=string

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://clearforest.com/">string</string>

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Input Parameters

Description

The input content sent to Calais is accompanied by parameters XML that includes processing directives, user directives and external metadata.

Below is a summary of mandatory input parameters for the API call:

Parameter Section Definition Values
contentType Processing Directives Format of the input content

"TEXT/XML",
"TEXT/TXT" or
"TEXT/HTML"
outputFormat Processing Directives Format of the returned results "XML/RDF" only
allowDistribution User Directives Indicates whether the extracted metadata can be distributed "true" or "false"
allowSearch User Directives Indicates whether future searches can be performed on the extracted metadata "true" or "false"
externalID User Directives User-generated ID for the each submission any string
submitter User Directives Identifier for the content submitter any string

In addition to that, users can add external metadata that will be returned in the response. This can be done by embedding an RDF representation of the user's metadata in the externalMetadata node.

Check the example in the next section - this is how the parameters XML should look like. Of course you may change the parameter values and the user's external metadata as explained above.

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Example Parameter File 

<c:params xmlns:c="http://s.opencalais.com/1/pred/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<c:processingDirectives c:contentType="text/txt" c:outputFormat="xml/rdf">

</c:processingDirectives>

<c:userDirectives c:allowDistribution="true" c:allowSearch="true" c:externalID="17cabs901" c:submitter="ABC">

</c:userDirectives>

<c:externalMetadata>

</c:externalMetadata>

</c:params>

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Input Content Format

As described in the previous section, Calais supports three formats of content: TEXT/XML, TEXT/TXT and TEXT/HTML.

In case the content is submitted as TEXT/XML, Calais will process the following XML sections:

Document Section Supported XML Tag Names
Document Title TITLE, HEADLINE, HEADER
Document Body BODY, DESCRIPTION, CONTENT
Document Date DATE, DATETIME, DATEANDTIME, PUBDATE

Please make sure your XML content conforms to these tag names in order for the metadata to be extracted correctly.

This version of Calais supports content in English only, but we will support additional languages soon. Check our roadmap to get a general idea of where we're headed over the next year.

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API Responses

Calais Semantic Metadata

Calais supports a rich set of semantic metadata, including entities, events and facts. We plan to extend the metadata in each future release!

Below is a list of entities, events and facts currently supported by Calais. To get more details on each metadata type including definitions and examples go to the Calais Semantic Metadata page.

Entities Events/Fact
    Anniversary     Acquisition
    City     Alliance
    Company     AnalystEarningsEstimate
    Continent     AnalystRecommendation
    Country     Bankruptcy
    Currency     BusinessRelation
    EmailAddress     Buybacks
    Facility     CompanyAffiliates
    FaxNumber     CompanyCustomer
    Holiday     CompanyEarningsAnnouncement
    IndustryTerm     CompanyEarningsGuidance
    NaturalDisaster     CompanyInvestment
    NaturalFeature     CompanyLegalIssues
    Organization     CompanyLocation
    Person     CompanyMeeting
    PhoneNumber     CompanyReorganization
    ProvinceOrState     CompanyTechnology
    Region     ConferenceCall
    Technology     CreditRating
    URL     FamilyRelation
      IPO
      JointVenture
      ManagementChange
      Merger
      PersonEducation
      PersonPolitical
      PersonPoliticalPast
      PersonProfessional
      PersonProfessionalPast
      Quotation
      StockSplit

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Response Format

Calais response is in the form of RDF. Below is a general guideline on how to interpret the RDF response.

For extracted metadata elements - Entities, Events and Facts - the RDF includes the following artifacts:

RDF Artifact Description
Element Description For each unique entity, event or fact, the description includes the type (for example, Company, Person, Acquisition), attributes values, and an ID (hash) of this unique element. When an attribute value is referred to by its ID (hash) and not as a literal string, it includes a comment containing the actual value for easier readability.

Examples:

The entity company for "ClearForest Ltd." may look like this:

<rdf:Description rdf:about="http://d.opencalais.com/comphash-1/9dd2192a-4cd2-3b9a-ac2f-b6a0d1fed773">
       <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Company"/>
       <c:name>ClearForest Ltd.</c:name>
</rdf:Description>

The event Acquisition between "Reuters" and “ClearForest Ltd.” may look like this:

<rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/e83cd693-2146-32a2-b1fe-c4a73615dbf0">
       <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/r/Acquisition"/>
       <!--Reuters-->
       <c:company_acquirer rdf:resource="http://d.opencalais.com/comphash-1/48344864-ce62-3064-ae05-a3b41fab186c"/>
       <!--ClearForest Ltd.-->
       <c:company_beingacquired rdf:resource="http://d.opencalais.com/comphash-1/9dd2192a-4cd2-3b9a-ac2f-b6a0d1fed773"/>
       <c:status>planned</c:status>
</rdf:Description>
RDF Artifact Description
Element Instances One or more individual instances (mentions) for each unique metadata element. Each element instance includes the Doc ID, the ID (hash) of the unique element, the detection of the instance (snippet of the input content where the metadata element was identified), and its offset and length values (relative to the input content after it has been converted into XML). Note that for readability purposes, each hash reference is followed by a comment that shows the actual element value.

Examples:

An instance for the unique company ClearForest Ltd. may look like this:

<rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/11">
       <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/>
       <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f"/>
       <c:subject rdf:resource="http://d.opencalais.com/comphash-1/9dd2192a-4cd2-3b9a-ac2f-b6a0d1fed773"/>
       <!--Company: ClearForest Ltd.-->
       <c:detection>[Reuters to acquire text search firm ]ClearForest[ &lt;/TITLE&gt;
  &lt;DATE&gt; Mon Apr 30, 2007 7:00am EDT]</c:detection>
       <c:offset>55</c:offset>
       <c:length>11</c:length>
  </rdf:Description>

And an instance for the unique Acquisition element between "Reuters" and “ClearForest Ltd.” may look like this:

<rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/22">
       <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo"/>
       <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f"/>
       <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/e83cd693-2146-32a2-b1fe-c4a73615dbf0"/>
       <!--Acquisition: company_acquirer: Reuters; company_beingacquired: ClearForest Ltd.; status: planned; -->
       <c:detection>[&lt;DOCUMENT&gt;
    &lt;TITLE&gt; ]Reuters to acquire text search firm ClearForest[ &lt;/TITLE&gt;
  &lt;DATE&gt; Mon Apr 30, 2007 7:00am EDT]</c:detection>
       <c:offset>19</c:offset>
       <c:length>47</c:length>
  </rdf:Description>

In addition, the RDF response includes general document and transaction information, such as the document language and submission date and time. It also includes the input content after it has been converted into valid XML for the actual processing by the Calais backend server.

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Example Input

Below is an example input in the form of an TEXT/XML document submitted to Calais: 

<DOCUMENT>
<TITLE> Reuters to acquire text search firm ClearForest </TITLE>
<DATE> Mon Apr 30, 2007 7:00am EDT </DATE>
<SOURCEURL> http://www.reuters.com/article/technology-media-telco-SP/idUSNAAD300120070430?sp=true </SOURCEURL>
<BYLINE> By Eric Auchard </BYLINE>
<BODY>
SAN FRANCISCO, April 30 (Reuters) - News and information supplier Reuters Group Plc (RTR.L: Quote, Profile, Research) said on Monday the company would acquire ClearForest Ltd., a maker of software used to search vast archives of news, Web pages and documents for relevant facts. 
The deal calls for Reuters to buy all of the outstanding shares of the privately held Israeli-American company. Terms were not disclosed. 
ClearForest is a provider of text analytics software, which is used to "tag," or categorize, unstructured information to extract facts about people, organizations, places or other details from news articles, Web pages and other documents. 
"This acquisition helps us to put in context our vast amount of content and to deliver more relevant information," said Gerry Campbell, who last year was named to head up the new search and strategic development group of Reuters. 
ClearForest's competitors include Autonomy Corp. (AUTN.L: Quote, Profile, Research) and privately held firms such as Nstein and Inxight, a spinout from Xerox Corp.'s (XRX.N: Quote, Profile, Research) Palo Alto Research Center. 
ClearForest has received approval from its shareholders and the deal is expected to close in about 30 days, subject to customary closing conditions, Reuters said. 
ClearForest, which is headquartered in Waltham, Massachusetts and conducts research and development in Or-Yehuda, Israel, near Tel Aviv, has about 30 employees. 
Investors led by Greylock Partners include DB Capital Partners, Pitango Venture Capital, Walden Israel, Booz Allen Hamilton, HarbourVest Partners and JP Morgan Partners. 
Reuters said it plans to keep the current management team in place, and retain its workforce, which is split between the United States and Israel. It will also support existing ClearForest products and customers, it said. 
ClearForest has roughly 50 corporate customers, including Dow Chemical, Reuters, Elsevier Science and International Finance Corp., who use the software to cull through databases for business intelligence, Campbell said. 
In a statement, Reuters said ClearForest is part of its drive to make search a pivotal element in how financial information is found and used. ClearForest gives Reuters access to the latest generation of search 
techniques, supplementing existing editorial coding approaches with auto-coding tools. 
Campbell, who was formerly head of search for Time Warner Inc.'s (TWX.N: Quote, Profile, Research) AOL LLC, will oversee the integration of ClearForest into Reuters broader search development effort. 
</BODY>
<COPYRIGHT>
(c) Reuters 2007. All rights reserved. Republication or redistribution ofReuters content, 
including by caching, framing or similar means, is expresslyprohibited without the prior written 
consent of Reuters. Reuters and the Reuterssphere logo are registered trademarks and trademarks of the Reuters group ofcompanies around the world.nNAAD3001
(c) Reuters 2008 All rights reserved
</COPYRIGHT>
</DOCUMENT>

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RDF Example Response

The response below is an example response for the "Example Input" content mentioned above:

<?xml version="1.0" encoding="utf-8"?>
<!--Use of the Calais Web Service is governed by the Terms of Service located at http://www.opencalais.com. By using this service or the results of the service you agree to these terms of service.-->
<!--Relations: Acquisition, CompanyInvestment, PersonProfessionalPast

Organization: Palo Alto Research Center
IndustryTerm: broader search development effort, text search, text analytics software, development group, information supplier, auto-coding tools, search techniques
Company: Autonomy Corp., Time Warner Inc., Elsevier Science, Reuters, Nstein, Xerox Corp., Pitango Venture Capital, Inxight, ClearForest Ltd., DB Capital Partners, JP Morgan Partners, Greylock Partners, Dow Chemical, Booz Allen, HarbourVest Partners, Reuters Group Plc, International Finance Corp., AOL LLC
Country: United States, Israel
Person: Gerry Campbell
ProvinceOrState: Massachusetts
City: Tel Aviv, SAN FRANCISCO, Waltham-->
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:c="http://s.opencalais.com/1/pred/">
  <rdf:Description c:allowDistribution="true" c:allowSearch="true" c:externalID="" c:id="http://id.opencalais.com/yTwsdv2IxvsC0aMpUX0OuA" rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/DocInfo" />
    <c:document><![CDATA[<DOCUMENT>
<TITLE> Reuters to acquire text search firm ClearForest </TITLE>
<DATE> Mon Apr 30, 2007 7:00am EDT </DATE>
<SOURCEURL> http://www.reuters.com/article/technology-media-telco-SP/idUSNAAD300120070430?sp=true </SOURCEURL>
<BYLINE> By Eric Auchard </BYLINE>
<BODY>
SAN FRANCISCO, April 30 (Reuters) - News and information supplier Reuters Group Plc (RTR.L: Quote, Profile, Research) said on Monday the company would acquire ClearForest Ltd., a maker of software used to search vast archives of news, Web pages and documents for relevant facts.
The deal calls for Reuters to buy all of the outstanding shares of the privately held Israeli-American company. Terms were not disclosed.
ClearForest is a provider of text analytics software, which is used to "tag," or categorize, unstructured information to extract facts about people, organizations, places or other details from news articles, Web pages and other documents.
"This acquisition helps us to put in context our vast amount of content and to deliver more relevant information," said Gerry Campbell, who last year was named to head up the new search and strategic development group of Reuters.
ClearForest's competitors include Autonomy Corp. (AUTN.L: Quote, Profile, Research) and privately held firms such as Nstein and Inxight, a spinout from Xerox Corp.'s (XRX.N: Quote, Profile, Research) Palo Alto Research Center.
ClearForest has received approval from its shareholders and the deal is expected to close in about 30 days, subject to customary closing conditions, Reuters said.
ClearForest, which is headquartered in Waltham, Massachusetts and conducts research and development in Or-Yehuda, Israel, near Tel Aviv, has about 30 employees.
Investors led by Greylock Partners include DB Capital Partners, Pitango Venture Capital, Walden Israel, Booz Allen Hamilton, HarbourVest Partners and JP Morgan Partners.
Reuters said it plans to keep the current management team in place, and retain its workforce, which is split between the United States and Israel. It will also support existing ClearForest products and customers, it said.
ClearForest has roughly 50 corporate customers, including Dow Chemical, Reuters, Elsevier Science and International Finance Corp., who use the software to cull through databases for business intelligence, Campbell said.
In a statement, Reuters said ClearForest is part of its drive to make search a pivotal element in how financial information is found and used. ClearForest gives Reuters access to the latest generation of search techniques, supplementing existing editorial coding approaches with auto-coding tools.
Campbell, who was formerly head of search for Time Warner Inc.'s (TWX.N: Quote, Profile, Research) AOL LLC, will oversee the integration of ClearForest into Reuters broader search development effort.
</BODY>
<COPYRIGHT>
(c) Reuters 2007. All rights reserved. Republication or redistribution ofReuters content, including by caching, framing or similar means, is expresslyprohibited without the prior written consent of Reuters. Reuters and the Reuterssphere logo are registered trademarks and trademarks of the Reuters group ofcompanies around the world.nNAAD3001
(c) Reuters 2008 All rights reserved
</COPYRIGHT>
</DOCUMENT>]]></c:document>
    <c:externalMetadata></c:externalMetadata>
    <c:submitter />
  </rdf:Description>
  <rdf:Description c:contentType="text/xml" c:emVer="UnifiedIM-DJ" c:langIdVer="DefaultLangId" c:language="English" c:processingVer="CalaisJob01" c:submitionDate="2008-01-28 04:24:33.127" rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/meta">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/DocInfoMeta" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:submitterCode>d98c1d-938dgy7</c:submitterCode>
    <c:signature>digestalg-1|fYaLFNoF3JmGnskKFTh0FU3NxbI=|YGjSkp1K/Tnwr8bfzjtGhG7oB6GExvYq4KeRmokjSZ2RQVWw1nHJ9w==</c:signature>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/lid/DefaultLangId">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/lid/DefaultLangId" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:lang rdf:resource="http://d.opencalais.com/lid/DefaultLangId/English" />
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/comphash-1/2085d8fb-a94d-3240-b642-218bb4e3fd9f">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Company" />
    <c:name>Elsevier Science</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/1">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/comphash-1/2085d8fb-a94d-3240-b642-218bb4e3fd9f" />
    <!--Company: Elsevier Science-->
    <c:detection>[customers, including Dow Chemical, Reuters, ]Elsevier Science[ and International Finance Corp., who use the]</c:detection>
    <c:offset>2191</c:offset>
    <c:length>16</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/fc29777d-877f-35c1-b05a-f73aa2b4b69b">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Organization" />
    <c:name>Palo Alto Research Center</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/2">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/fc29777d-877f-35c1-b05a-f73aa2b4b69b" />
    <!--Organization: Palo Alto Research Center-->
    <c:detection>[Xerox Corp.'s (XRX.N: Quote, Profile, Research) ]Palo Alto Research Center[.
ClearForest has received approval from its]</c:detection>
    <c:offset>1362</c:offset>
    <c:length>25</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/2ca57cf9-c0fd-3699-a132-02a0e2a91393">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/r/CompanyInvestment" />
    <!--ClearForest Ltd.-->
    <c:company rdf:resource="http://d.opencalais.com/comphash-1/9dd2192a-4cd2-3b9a-ac2f-b6a0d1fed773" />
    <!--Pitango Venture Capital-->
    <c:company_investor rdf:resource="http://d.opencalais.com/comphash-1/deb70940-87bf-3a34-9d67-ff1bd2240c46" />
    <c:status>known</c:status>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/3">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/2ca57cf9-c0fd-3699-a132-02a0e2a91393" />
    <!--CompanyInvestment: company: ClearForest Ltd.; company_investor: Pitango Venture Capital; status: known; -->
    <c:detection>[Israel, near Tel Aviv, has about 30 employees.
]Investors led by Greylock Partners include DB Capital Partners, Pitango Venture Capital[, Walden Israel, Booz Allen Hamilton, HarbourVest]</c:detection>
    <c:offset>1716</c:offset>
    <c:length>87</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/comphash-1/67f45424-b1d0-3a5a-b835-f372cce7afec">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Company" />
    <c:name>Autonomy Corp.</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/4">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/comphash-1/67f45424-b1d0-3a5a-b835-f372cce7afec" />
    <!--Company: Autonomy Corp.-->
    <c:detection>[of Reuters.
ClearForest's competitors include ]Autonomy Corp.[ (AUTN.L: Quote, Profile, Research) and privately]</c:detection>
    <c:offset>1196</c:offset>
    <c:length>14</c:length>
  </rdf:Description>
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ClearForest, which is headquartered in Waltham, ]Massachusetts[ and conducts research and development in]</c:detection>
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    <c:detection>[&lt;DOCUMENT&gt;
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&lt;DATE&gt; Mon Apr 30, 2007]</c:detection>
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    <c:detection>[FRANCISCO, April 30 (Reuters) - News and ]information supplier[ Reuters Group Plc (RTR.L: Quote, Profile,]</c:detection>
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    <c:detection>[said.
ClearForest, which is headquartered in ]Waltham[, Massachusetts and conducts research and]</c:detection>
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    <c:detection>[Booz Allen Hamilton, HarbourVest Partners and ]JP Morgan Partners[.
Reuters said it plans to keep the current]</c:detection>
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&lt;TITLE&gt; ]Reuters[ to acquire text search firm ClearForest]</c:detection>
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    <c:detection>[for relevant facts.
The deal calls for ]Reuters[ to buy all of the outstanding shares of the]</c:detection>
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ClearForest's competitors include Autonomy]</c:detection>
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ClearForest, which is headquartered in]</c:detection>
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In a statement, ]Reuters[ said ClearForest is part of its drive to make]</c:detection>
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Investors led by]</c:detection>
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    <c:detection>[
Campbell, who was formerly head of search for ]Time Warner Inc.['s (TWX.N: Quote, Profile, Research) AOL LLC,]</c:detection>
    <c:offset>2676</c:offset>
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    <c:detection>[coding approaches with auto-coding tools.
]Campbell, who was formerly head of search for Time Warner Inc.['s (TWX.N: Quote, Profile, Research) AOL LLC,]</c:detection>
    <c:offset>2630</c:offset>
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  <rdf:Description rdf:about="http://d.opencalais.com/comphash-1/f54e195c-12c7-33d1-8d75-e0c206b1736e">
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    <c:detection>[ firms such as Nstein and Inxight, a spinout from ]Xerox Corp.['s (XRX.N: Quote, Profile, Research) Palo Alto]</c:detection>
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    <c:subject rdf:resource="http://d.opencalais.com/comphash-1/deb70940-87bf-3a34-9d67-ff1bd2240c46" />
    <!--Company: Pitango Venture Capital-->
    <c:detection>[Greylock Partners include DB Capital Partners, ]Pitango Venture Capital[, Walden Israel, Booz Allen Hamilton, HarbourVest]</c:detection>
    <c:offset>1780</c:offset>
    <c:length>23</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/comphash-1/17cefafb-058f-3667-8613-c2e79f10aa2f">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Company" />
    <c:name>Inxight</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/50">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/comphash-1/17cefafb-058f-3667-8613-c2e79f10aa2f" />
    <!--Company: Inxight-->
    <c:detection>[and privately held firms such as Nstein and ]Inxight[, a spinout from Xerox Corp.'s (XRX.N: Quote,]</c:detection>
    <c:offset>1290</c:offset>
    <c:length>7</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/comphash-1/bcd23a6f-3ead-3bc9-84c1-0aa9c5ccfd15">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Company" />
    <c:name>Greylock Partners</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/51">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/comphash-1/bcd23a6f-3ead-3bc9-84c1-0aa9c5ccfd15" />
    <!--Company: Greylock Partners-->
    <c:detection>[Aviv, has about 30 employees.
Investors led by ]Greylock Partners[ include DB Capital Partners, Pitango Venture]</c:detection>
    <c:offset>1733</c:offset>
    <c:length>17</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/3a76063a-9788-387e-9769-e99f3a1aaef5">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/IndustryTerm" />
    <c:name>text analytics software</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/52">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/3a76063a-9788-387e-9769-e99f3a1aaef5" />
    <!--IndustryTerm: text analytics software-->
    <c:detection>[not disclosed.
ClearForest is a provider of ]text analytics software[, which is used to "tag," or categorize,]</c:detection>
    <c:offset>720</c:offset>
    <c:length>23</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/935b672f-e696-33fc-843c-271f4a4ca051">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/r/Acquisition" />
    <!--Reuters Group Plc-->
    <c:company_acquirer rdf:resource="http://d.opencalais.com/comphash-1/99f78043-e40a-3658-99d0-4c9793dac0a8" />
    <!--ClearForest Ltd.-->
    <c:company_beingacquired rdf:resource="http://d.opencalais.com/comphash-1/9dd2192a-4cd2-3b9a-ac2f-b6a0d1fed773" />
    <c:status>planned</c:status>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/53">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/935b672f-e696-33fc-843c-271f4a4ca051" />
    <!--Acquisition: company_acquirer: Reuters Group Plc; company_beingacquired: ClearForest Ltd.; status: planned; -->
    <c:detection>[FRANCISCO, April 30 (Reuters) - News and ]information supplier Reuters Group Plc (RTR.L: Quote, Profile, Research) said on Monday the company would acquire ClearForest Ltd., a maker of software used to search vast archives of news[, Web pages and documents for relevant facts.]</c:detection>
    <c:offset>317</c:offset>
    <c:length>188</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/c7bb95b5-b41e-384f-8d02-6f2a16e59201">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/IndustryTerm" />
    <c:name>broader search development effort</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/54">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/c7bb95b5-b41e-384f-8d02-6f2a16e59201" />
    <!--IndustryTerm: broader search development effort-->
    <c:detection>[the integration of ClearForest into Reuters ]broader search development effort[.
&lt;/BODY&gt;
&lt;COPYRIGHT&gt;
(c) Reuters 2007. All]</c:detection>
    <c:offset>2795</c:offset>
    <c:length>33</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/comphash-1/d57dcfbf-3c08-3b6b-a13f-656dbb544d37">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Company" />
    <c:name>DB Capital Partners</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/55">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/comphash-1/d57dcfbf-3c08-3b6b-a13f-656dbb544d37" />
    <!--Company: DB Capital Partners-->
    <c:detection>[
Investors led by Greylock Partners include ]DB Capital Partners[, Pitango Venture Capital, Walden Israel, Booz]</c:detection>
    <c:offset>1759</c:offset>
    <c:length>19</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/pershash-1/7914b120-a7cf-3c14-b8c1-744bb0b0d5cb">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Person" />
    <c:name>Gerry Campbell</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/56">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/pershash-1/7914b120-a7cf-3c14-b8c1-744bb0b0d5cb" />
    <!--Person: Gerry Campbell-->
    <c:detection>[and to deliver more relevant information," said ]Gerry Campbell[, who last year was named to head up the new]</c:detection>
    <c:offset>1051</c:offset>
    <c:length>14</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/57">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/pershash-1/7914b120-a7cf-3c14-b8c1-744bb0b0d5cb" />
    <!--Person: Gerry Campbell-->
    <c:detection>[through databases for business intelligence, ]Campbell[ said.
In a statement, Reuters said ClearForest]</c:detection>
    <c:offset>2315</c:offset>
    <c:length>8</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/58">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/pershash-1/7914b120-a7cf-3c14-b8c1-744bb0b0d5cb" />
    <!--Person: Gerry Campbell-->
    <c:detection>[coding approaches with auto-coding tools.
]Campbell[, who was formerly head of search for Time Warner]</c:detection>
    <c:offset>2630</c:offset>
    <c:length>8</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/509f68bb-d48f-3e49-adbb-ed7545fd3058">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/Country" />
    <c:name>Israel</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/59">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/509f68bb-d48f-3e49-adbb-ed7545fd3058" />
    <!--Country: Israel-->
    <c:detection>[conducts research and development in Or-Yehuda, ]Israel[, near Tel Aviv, has about 30 employees.]</c:detection>
    <c:offset>1668</c:offset>
    <c:length>6</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/60">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/509f68bb-d48f-3e49-adbb-ed7545fd3058" />
    <!--Country: Israel-->
    <c:detection>[which is split between the United States and ]Israel[. It will also support existing ClearForest]</c:detection>
    <c:offset>2026</c:offset>
    <c:length>6</c:length>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/genericHasher-1/a276e21a-be1d-3415-91a1-8eb4312560c2">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/em/e/IndustryTerm" />
    <c:name>search techniques</c:name>
  </rdf:Description>
  <rdf:Description rdf:about="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f/Instance/61">
    <rdf:type rdf:resource="http://s.opencalais.com/1/type/sys/InstanceInfo" />
    <c:docId rdf:resource="http://d.opencalais.com/dochash-1/37042f2e-8a72-30c7-afe2-2710efcb4d5f" />
    <c:subject rdf:resource="http://d.opencalais.com/genericHasher-1/a276e21a-be1d-3415-91a1-8eb4312560c2" />
    <!--IndustryTerm: search techniques-->
    <c:detection>[ gives Reuters access to the latest generation of ]search techniques[, supplementing existing editorial coding]</c:detection>
    <c:offset>2535</c:offset>
    <c:length>17</c:length>
  </rdf:Description>
</rdf:RDF>

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Error Messages

The Calais web service response may indicate errors in submission or processing stages.

Error message will be returned as an XML response in the following format: 

<Error Method="ProcessText"><Exception> -- Error Message Here -- .</Exception></Error>

Below is a summary of error messages:

Message
Illegal Content-Type.
Provided content has a wrong format.
paramsXML is invalid.
Missing a mandatory paramsXML item.
Length has exceeded the allowed size.
Calais Backend-Server is Busy. Please try again later..
Calais Backend-Server has accepted the document and has already started to process it, but was unable to finish its processing within the time limit.
Error while communicating with Calais Backend-Server.
Document conversion error. Please make sure that the content-type (passed