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branches/PublicaMundi_David-devel/docs/client/what.rst
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What is ZOO-Client ?
ZOO-Client is a client-side JavaScript API which provides simple methods for interacting with WPS server from web applications. It is helpful for sending requests to any WPS compliant server (such as :ref:`kernel_index`) and to parse the output responses using simple JavaScript.
JavaScript
ZOO-Client relies on modern JavaScript libraries and can be seamlessly integrated in new or existing web platforms or applications. ZOO-Client works by expanding the tags available in WPS specific templates using values provided by a JavaScript hash or object. It allows to build valid WPS requests and to send them to a WPS server. It also provides functions to easily parse and reuse the output XML responses. Read the :ref:`next section <client-howto>` to get started.
Templates
ZOO-Client uses logic-less Mustache templates for creating well-formed WPS requests. Templates are called logic-less because they do not contain any if statements, else clauses, or for loops, but only tags. Some tags are dynamically replaced by a value or a series of values.
GetCapabilities
GetCapabilities requests are created using the following template:
<wps:GetCapabilities xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 ../wpsGetCapabilities_request.xsd" language="{{language}}" service="WPS">
<wps:AcceptVersions>
<ows:Version>1.0.0</ows:Version>
</wps:AcceptVersions>
</wps:GetCapabilities>
DescribeProcess
DescribeProcess requests are created using the following template:
<DescribeProcess xmlns="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 ../wpsDescribeProcess_request.xsd" service="WPS" version="1.0.0" language="{{language}}">
{{#identifiers}}
<ows:Identifier>{{.}}</ows:Identifier>
{{/identifiers}}
</DescribeProcess>
Execute
Execute requests are created using a more complex template, as shown bellow:
<wps:Execute service="WPS" version="1.0.0" xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wps/1.0.0../wpsExecute_request.xsd" language="{{language}}">
<!-- template-version: 0.21 -->
<ows:Identifier>{{Identifier}}</ows:Identifier>
<wps:DataInputs>
{{#DataInputs}}
{{#is_literal}}
<wps:Input>
<ows:Identifier>{{identifier}}</ows:Identifier>
<wps:Data>
<wps:LiteralData{{#dataType}} dataType="{{dataType}}"{{/dataType}}>{{value}}</wps:LiteralData>
</wps:Data>
</wps:Input>
{{/is_literal}}
{{#is_bbox}}
<wps:Input>
<ows:Identifier>{{identifier}}</ows:Identifier>
<wps:Data>
<wps:BoundingBoxData ows:crs="{{crs}}" ows:dimensions="{{dimension}}">
<ows:LowerCorner>{{lowerCorner}}</ows:LowerCorner>
<ows:UpperCorner>{{upperCorner}}</ows:UpperCorner>
</wps:BoundingBoxData>
</wps:Data>
</wps:Input>
{{/is_bbox}}
{{#is_complex}}
{{#is_reference}}
{{#is_get}}
<wps:Input>
<ows:Identifier>{{identifier}}</ows:Identifier>
<wps:Reference xlink:href="{{href}}"{{#schema}} schema="{{shema}}"{{/schema}}{{#mimeType}} mimeType="{{mimeType}}"{{/mimeType}}{{#encoding}} encoding="{{encoding}}"{{/encoding}}/>
</wps:Input>
{{/is_get}}
{{#is_post}}
<wps:Input>
<ows:Identifier>{{identifier}}</ows:Identifier>
<wps:Reference xlink:href="{{href}}" method="{{method}}">
{{#headers}}
<wps:Header key="{{key}}" value="{{value}}" />
{{/headers}}
<wps:Body>{{{value}}}</wps:Body>
</wps:Reference>
</wps:Input>
{{/is_post}}
{{/is_reference}}
{{^is_reference}}
<wps:Input>
<ows:Identifier>{{identifier}}</ows:Identifier>
<wps:Data>
<wps:ComplexData{{#schema}} schema="{{shema}}"{{/schema}}{{#mimeType}} mimeType="{{mimeType}}"{{/mimeType}}{{#encoding}} encoding="{{encoding}}"{{/encoding}}>{{#is_XML}}
{{{value}}}{{/is_XML}}{{^is_XML}}<![CDATA[{{{value}}}]]>{{/is_XML}}
</wps:ComplexData>
</wps:Data>
</wps:Input>
{{/is_reference}}
{{/is_complex}}
{{/DataInputs}}
</wps:DataInputs>
<wps:ResponseForm>
{{#RawDataOutput}}
{{#DataOutputs}}
<wps:RawDataOutput mimeType="{{mimeType}}">
<ows:Identifier>{{identifier}}</ows:Identifier>
</wps:RawDataOutput>
{{/DataOutputs}}
{{/RawDataOutput}}
{{^RawDataOutput}}
<wps:ResponseDocument{{#storeExecuteResponse}} storeExecuteResponse="{{storeExecuteResponse}}"{{/storeExecuteResponse}}{{#lineage}} lineage="{{lineage}}"{{/lineage}}{{#status}} status="{{status}}"{{/status}}>
{{#DataOutputs}}
{{#is_literal}}
<wps:Output{{#dataType}} dataType="{{dataType}}"{{/dataType}}{{#uom}} uom="{{uom}}"{{/uom}}>
<ows:Identifier>{{identifier}}</ows:Identifier>
</wps:Output>
{{/is_literal}}
{{^is_literal}}
<wps:Output{{#asReference}} asReference="{{asReference}}"{{/asReference}}{{#schema}} schema="{{schema}}"{{/schema}}{{#mimeType}} mimeType="{{mimeType}}"{{/mimeType}}{{#encoding}} encoding="{{encoding}}"{{/encoding}}>
<ows:Identifier>{{identifier}}</ows:Identifier>
</wps:Output>
{{/is_literal}}
{{/DataOutputs}}
</wps:ResponseDocument>
{{/RawDataOutput}}
</wps:ResponseForm>
</wps:Execute>
