% layout 'main', title => 'KorAP: CQL';

%= page_title

<p>CQL stands for Contextual Query Language. The main purpose of CQL is to represent queries to information retrieval systems. In fact, CQL is commonly used together with the Search/Retrieve via URL (SRU) protocol to represent URL-friendly search queries.</p>
    
<p>In KorAP, we support basic CQL as defined in the <a href="https://www.clarin.eu/content/federated-content-search-clarin-fcs">CLARIN Federated Content Search (FCS)</a> specification for basic search. KorAP does not support other operators and modifiers than AND and OR, such as REL and PROX.</p>

<section id="examples">
    <h3>Examples</h3>
    <p>Querying a simple term</p>
    %= doc_query cql => 'Feuer'
    
    <p>Querying a phrase</p>
    %= doc_query cql => '"Öl ins Feuer"'
    
    <p>Boolean queries</p>
    %= doc_query cql => 'giessen OR gießen'
    %= doc_query cql => 'Feuer and gießen'
</section>

<section id="References">
    <h3>References: </h3>
    <p><%= ext_link_to 'searchRetrieve: Part 5', "http://docs.oasis-open.org/search-ws/searchRetrieve/v1.0/os/part5-cql/searchRetrieve-v1.0-os-part5-cql.doc" %>.
      <%= ext_link_to 'CQL: The Contextual Query Language version 1.0', "https://www.loc.gov/standards/sru/cql/" %>, OASIS, January 2013</p>
</section>
