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<p><a class='wikilink' href='../Main/HomePage.html'>Main</a> > <span class='wikitrail'><a class='wikilink' href='Main.html'>Reference Manual</a> > <a class='wikilink' href='Modeling.html'>Modeling</a> > <a class='selflink' href='ModelingLoad.html'>Load</a></span>
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<p class='vspace'>Loads are used to model the capacity consumption of an operation.
</p>
<div class='vspace'></div><h2>Fields</h2>
<table border='1' width='100%' ><tr><td width='20%' valign='top'><strong>Field</strong>
</td><td width='20%' valign='top'><strong>Type</strong>
</td><td width='60%' valign='top'><strong>Description</strong>
</td></tr><tr><td valign='top'>resource
</td><td valign='top'>resource
</td><td valign='top'>
<p>Resource being loaded.<br />This is a required field.
</p></td></tr><tr><td valign='top'>operation
</td><td valign='top'>operation
</td><td valign='top'>
<p>Operation loading the resource.<br />This is a required field.
</p></td></tr><tr><td valign='top'>quantity
</td><td valign='top'>double
</td><td valign='top'>
<p>Load factor of the resource.<br />The default value is 1.0.
</p></td></tr><tr><td valign='top'>effective_start
</td><td valign='top'>dateTime
</td><td valign='top'>
<p>Date after which the resource load is valid.<br />Before this date the planned quantity is always 0.
</p></td></tr><tr><td valign='top'>effective_end
</td><td valign='top'>dateTime
</td><td valign='top'>
<p>Date at which the resource load becomes invalid.<br />After this date (and also at the exact date) the planned quantity is always 0.
</p></td></tr><tr><td valign='top'>priority
</td><td valign='top'>integer
</td><td valign='top'>
<p>Priority of the load, used in case of alternate load.<br />The default is 1. Lower numbers indicate more preferred loads.
</p></td></tr><tr><td valign='top'>name
</td><td valign='top'>non-empty string
</td><td valign='top'>
<p>Optional name of the load.<br />A name is only useful when using alternate loads. Otherwise leave it empty to save some memory.
</p></td></tr><tr><td valign='top'>alternate
</td><td valign='top'>non-empty string<br />or<br />load
</td><td valign='top'>Name of the load of which this is an alternate.<br />When using the Python API the argument can be a load or a string.<br />When using the XML data format the argument is a string.
</td></tr><tr><td valign='top'>setup
</td><td valign='top'>non-empty string
</td><td valign='top'>Name of the required setup on the resource.
</td></tr><tr><td valign='top'>search
</td><td valign='top'>string
</td><td valign='top'>
<p>Defines the order of preference among the alternate loads.<br />The valid choices are:
</p><ul><li>PRIORITY<br /> Select the alternate with the lowest priority number.<br /> This is the default.
</li><li>MINCOST<br /> Select the alternate which gives the lowest cost.<br /> The cost includes the cost of all upstream operations, resources and buffers.
</li><li>MINPENALTY<br /> Select the alternate which gives the lowest penalty.<br /> The penalty includes the penalty of all penalties incurred in the upstream plan along the flow.
</li><li>MINCOSTPENALTY<br /> Select the alternate which gives the lowest sum of the cost and penalty.<br /> The sum is computed for the complete upstream path.
</li></ul></td></tr><tr><td valign='top'>action
</td><td valign='top'>A<br />C<br />AC (default)<br />R
</td><td valign='top'>
<p>Type of action to be executed:
</p><ul><li>A: Add an new entity, and report an error if the entity already exists.
</li><li>C: Change an existing entity, and report an error if the entity doesn't exist yet.
</li><li>AC: Change an entity or create a new one if it doesn't exist yet.
</li><li>R: Remove an entity, and report an error if the entity doesn't exist.
</li></ul></td></tr></table>
<div class='vspace'></div><h2>Example XML structures</h2>
<ul><li>Defining a load
</li></ul><pre> <plan>
<loads>
<load>
<resource name="machine A"/>
<operation name="operation B"/>
</load>
</loads>
</plan>
</pre><div class='vspace'></div><ul><li>Defining a load nested in an operation structure.<br /> Resources A AND B are used by the operation.
</li></ul><pre> <plan>
<operations>
<operation name="operation B">
<loads>
<load>
<resource name="machine A"/>
<usage>1</usage>
</load>
<load>
<resource name="machine B"/>
<usage>1</usage>
</load>
</loads>
</operation>
</operations>
</plan>
</pre><div class='vspace'></div><ul><li>Defining a load nested in an operation structure.<br /> Resource A OR B is used by the operation.
</li></ul><pre> <plan>
<operations>
<operation name="operation B">
<loads>
<load>
<resource name="machine A"/>
<usage>1</usage>
<priority>0</priority>
<name>alt</name>
</load>
<load>
<resource name="machine B"/>
<usage>1</usage>
<priority>1</priority>
<alternate>alt</alternate>
</load>
</loads>
</operation>
</operations>
</plan>
</pre><div class='vspace'></div><ul><li>Defining a load nested in a resource structure
</li></ul><pre> <plan>
<resources>
<resource name="machine A">
<loads>
<load>
<operation name="operation B"/>
<usage>2</usage>
</load>
<load>
<operation name="operation C"/>
<usage>1</usage>
</load>
</loads>
</resource>
</resources>
</plan>
</pre><div class='vspace'></div><ul><li>Deleting a load
</li></ul><pre> <plan>
<loads>
<load action="R">
<resource name="machine A"/>
<operation name="operation B"/>
</load>
</loads>
</plan>
</pre>
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