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<title>Setup Specificity Fallback :: AL Guidelines</title>
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<li data-nav-id=/navpatterns/1-patterns/creating-custom-charts/ title="Creating Custom Charts" class=dd-item><a href=/navpatterns/1-patterns/creating-custom-charts/>Creating Custom Charts</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-end/>Begin-End - Compound Only</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ title="Blank Lines.md" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/>Blank Lines.md</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ title="Blank Lines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/>Blank Lines</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/case-actions/ title="CASE Action" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/case-actions/>CASE Action</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/ title="Colon usage in CASE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/>Colon usage in CASE</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/ title="Comments inside Curly Brackets" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/>Comments inside Curly Brackets</a></li>
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<nav id=TableOfContents>
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<ul>
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<li><a href=#abstract><strong>Abstract</strong></a></li>
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<li><a href=#description>**Description</a></li>
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<li><a href=#description><strong>Description</strong></a></li>
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<li><a href=#usage><strong>Usage</strong></a></li>
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<li><a href=#nav-usages><strong>NAV Usages</strong></a></li>
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</ul>
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<p><em>By Jan Hoek at IDYN</em></p>
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<h2 id=abstract><strong>Abstract</strong></h2>
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<p>The Setup Specificity Fallback pattern allows users to efficiently define a potentially complex setup in terms of rules and exceptions to these rules, exceptions to the exceptions, etc.</p>
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<h2 id=description>**Description</h2>
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<p>**</p>
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<h2 id=description><strong>Description</strong></h2>
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<p>The pattern involves a setup table with a compound (i.e. consisting of more than one field) primary key, where each record in the table maps a combination of primary key values to a particular setup value. However, setting up and maintaining each and every combination could prove to be rather labour-intensive.</p>
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<p>With the Setup Specificity Pattern in place, primary key fields in the setup table can have a special value (typically: zero or an empty string) that acts as a wildcard, meaning that the setup record in question applies to a combination of primary key fields with any value in the field containing that wildcard. According to the pattern, when querying the setup table, the application attempts to find the appropriate setup record by searching less and less specific, starting with only specified primary key values, and possibly ending with only wildcard values, replacing specific values with wildcards in a predefined order until a setup record is found, e.g.:</p>
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<p>Step 1.</p>
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