75 lines
3.4 KiB
HTML
75 lines
3.4 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-us" lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-15" />
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<link rel="stylesheet" type="text/css" href="sdd1.css">
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</head>
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<body bgcolor="#ffffff">
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<a name="PageTop"></a>
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<p />
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<h2><a name="SDD_Part_0_Introduction_and_Prim"></a> SDD Part 0: Introduction and Primer to the SDD Standard </h2>
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<p />
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<h3><a name="3_11_Dependencies_in_SDD"></a> 3.11 Dependencies in SDD </h3>
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<p />
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Dependencies are logical relationships between characters such that a state of one character controls the presence (or absence) of another feature in interactive keys.
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<p />
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Consider, for example, the following features:
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<p />
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<img alt="depend.jpg" src="http://wiki.tdwg.org/twiki/static/_publish/depend.jpg" />
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<p />
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Wing colour and Wing shape only have meaning when wings are present – if wings are absent, they are logically inappropriate in the key. Relationships of this kind are generally accomodated within interactive identification applications by the use of dependencies. For the above example a negative dependency may be set such that if a user chooses the state Wings: absent, then the characters Wing Colour and Wing Shape will be removed from characters Available. Alternatively, some applications allow a positive dependency to be set so for example Wing Colour and Wing Shape are initially hidden and only appear if a user chooses the state Wings: present. Dependencies can help to keep the character list cleaner and less cluttered, and help make some features work better.
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<p />
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In SDD dependencies are defined by <DependencyRules> within the <CharacterTree> element.
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<p />
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A simple SDD code instance representing dependency definition has the basic structure shown below and in Example 3.11.1.
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<p />
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<img alt="chartreenodeseq.gif" src="http://wiki.tdwg.org/twiki/static/_publish/chartreenodeseq.gif" />
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<p />
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<h4><a name="Example_3_11_1_Negative_dependen"></a> Example 3.11.1 - Negative dependencies in SDD. </h4>
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<p />
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<table bgcolor="#ddddff" border="0" width="100%" cellpadding="5" cellspacing="5" style="border-collapse: collapse" bordercolor="#111111">
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<p />
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<tr>
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<td>
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<p />
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<pre>
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<Nodes>
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<CharNode>
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<DependencyRules>
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<InapplicableIf>
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<State ref="s13"/>
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</InapplicableIf>
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</DependencyRules>
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<Character ref="c1"/>
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</CharNode>
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<CharNode>
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<DependencyRules>
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<InapplicableIf>
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<State ref="s4"/>
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<State ref="s13"/>
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</InapplicableIf>
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</DependencyRules>
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<Character ref="c2"/>
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</CharNode>
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... etc.
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</Nodes>
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</pre>
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<p />
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</td>
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</tr>
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<p />
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</table>
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<p />
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Positive dependencies are expressed in the same fashion with the <InapplicableIf> tag
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<p />
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It is currently unknown how applications which enforce referential integrity between scored data and dependencies will manage data imported from applications which do not enforce referential integrity.
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<p />
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<p />
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<p />
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<p />
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-- DonovanSharp - 01 Jun 2006
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<p />
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<p />
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</body></html>
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