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class="chartlet-focus"><summary>Focus</summary><fieldset><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" checked> Show all</label><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" class="chartlet-focus-node" id="chartlet-6dde3ab5de8f2092-focus-0"> Customer</label><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" class="chartlet-focus-node" id="chartlet-6dde3ab5de8f2092-focus-1"> Order</label><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" class="chartlet-focus-node" id="chartlet-6dde3ab5de8f2092-focus-2"> Invoice</label><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" class="chartlet-focus-node" id="chartlet-6dde3ab5de8f2092-focus-3"> InvoiceLine</label><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" class="chartlet-focus-node" id="chartlet-6dde3ab5de8f2092-focus-4"> TaxRate</label><label><input type="radio" name="chartlet-6dde3ab5de8f2092-focus" class="chartlet-focus-node" id="chartlet-6dde3ab5de8f2092-focus-5"> Reminder</label></fieldset></details><figure class="chartlet-figure" data-viz="chart"><figcaption>Orders and their invoices</figcaption><div class="chartlet-stage"><svg xmlns="http://www.w3.org/2000/svg" width="900" height="760" viewBox="0 0 900 760" id="chartlet-6dde3ab5de8f2092" role="img" aria-labelledby="chartlet-6dde3ab5de8f2092-title chartlet-6dde3ab5de8f2092-description" class="chartlet-root"><title id="chartlet-6dde3ab5de8f2092-title">Orders and their invoices</title><desc id="chartlet-6dde3ab5de8f2092-description">Class diagram with 6 classes and 5 relations in 2 packages. Sales: Customer, Order. Billing: Invoice, InvoiceLine, TaxRate. Most connected: Invoice (3 connections). Bottleneck: Invoice; without it the diagram falls apart. Customer: 2 attributes, 0 methods. Customer is associated with Order (1 : 0..*) [places]. Order: 2 attributes, 1 method. Order is associated with Invoice (1 : 1..*) [billed as]. Invoice: 2 attributes, 1 method. Invoice is composed of InvoiceLine (1 : 1..*) [lists]; is associated with Reminder (1 : 0..3) [dunned by]. InvoiceLine: 2 attributes, 0 methods. InvoiceLine is associated with TaxRate (* : 1) [taxed at]. TaxRate: 2 attributes, 0 methods. Reminder: 2 attributes, 0 methods.</desc><style>.chartlet-root{--chartlet-text:#172033;--chartlet-muted:#344054;--chartlet-grid:#d9dee8;--chartlet-zero:#667085;--chartlet-accent:#2563eb;--chartlet-background:#fff;--chartlet-color-1:#2563eb;--chartlet-color-2:#c2410c;--chartlet-color-3:#475569;--chartlet-color-4:#111827;max-width:100%;height:auto;font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:var(--chartlet-text)}#chartlet-6dde3ab5de8f2092 .chartlet-title{font-size:22px;font-weight:650;fill:var(--chartlet-text)}#chartlet-6dde3ab5de8f2092 .chartlet-label,#chartlet-6dde3ab5de8f2092 .chartlet-tick,#chartlet-6dde3ab5de8f2092 .chartlet-value,#chartlet-6dde3ab5de8f2092 .chartlet-value-inverse,#chartlet-6dde3ab5de8f2092 .chartlet-axis-title{font-size:12px;fill:var(--chartlet-muted)}#chartlet-6dde3ab5de8f2092 .chartlet-value,#chartlet-6dde3ab5de8f2092 .chartlet-value-inverse{font-weight:600}#chartlet-6dde3ab5de8f2092 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.chartlet-flow-open{fill:none;stroke:var(--chartlet-zero);stroke-width:1.4;stroke-linejoin:round}</style><rect x="372" y="16" width="152" height="304" class="chartlet-flow-group"/><text x="380" y="29" text-anchor="start" class="chartlet-flow-group-label">Sales</text><g class="chartlet-f chartlet-f-0 chartlet-f-1"><polyline points="448,124 448,204" class="chartlet-flow-edge"><title>Customer → Order: places</title></polyline><text x="436" y="200" text-anchor="end" class="chartlet-flow-card">0..*</text><text x="436" y="136" text-anchor="end" class="chartlet-flow-card">1</text></g><g class="chartlet-f chartlet-f-1 chartlet-f-2"><polyline points="448,308 448,386.111 228,386.111 228,420 228,448" class="chartlet-flow-edge"><title>Order → Invoice: billed as</title></polyline><text x="216" y="444" text-anchor="end" class="chartlet-flow-card">1..*</text><text x="436" y="320" text-anchor="end" class="chartlet-flow-card">1</text></g><g class="chartlet-f chartlet-f-2 chartlet-f-5"><polyline points="228,552 228,564 228,625.667 448,625.667 448,660" class="chartlet-flow-edge"><title>Invoice → Reminder: dunned by</title></polyline><text x="436" y="656" text-anchor="end" class="chartlet-flow-card">0..3</text><text x="216" y="564" text-anchor="end" class="chartlet-flow-card">1</text></g><g class="chartlet-f chartlet-n-0 chartlet-f-0 chartlet-f-1"></g><g class="chartlet-f chartlet-n-1 chartlet-f-0 chartlet-f-1 chartlet-f-2"></g><g class="chartlet-f chartlet-n-5 chartlet-f-2 chartlet-f-5"></g><g class="chartlet-f chartlet-f-0 chartlet-f-1"><rect x="452" y="129" width="47.2" height="21" class="chartlet-diagram-chip"/><text x="457" y="143" text-anchor="start" class="chartlet-diagram-chip-text">places</text></g><g class="chartlet-f chartlet-f-1 chartlet-f-2"><rect x="452" y="323" width="58.24" height="21" class="chartlet-diagram-chip"/><text x="457" y="337" text-anchor="start" class="chartlet-diagram-chip-text">billed as</text></g><g class="chartlet-f chartlet-f-2 chartlet-f-5"><rect x="156.4" y="569" width="67.6" height="21" class="chartlet-diagram-chip"/><text x="219" y="583" text-anchor="end" class="chartlet-diagram-chip-text">dunned by</text></g><g class="chartlet-f chartlet-n-0 chartlet-f-0 chartlet-f-1"><rect x="392" y="46.5" width="112" height="80" class="chartlet-diagram-shadow"/><rect x="392" y="44" width="112" height="80" class="chartlet-flow-node chartlet-role-blue chartlet-class"><title>Customer</title></rect><text x="448" y="70" text-anchor="middle" class="chartlet-flow-label">Customer</text><line x1="392" y1="76" x2="504" y2="76" class="chartlet-flow-inner"/><text x="404" y="93" text-anchor="start" class="chartlet-class-member">+ id: Int</text><text x="404" y="108" text-anchor="start" class="chartlet-class-member">+ name: String</text></g><g class="chartlet-f chartlet-n-1 chartlet-f-0 chartlet-f-1 chartlet-f-2"><rect x="384" y="206.5" width="128" height="104" class="chartlet-diagram-shadow"/><rect x="384" y="204" width="128" height="104" class="chartlet-flow-node chartlet-role-blue chartlet-class"><title>Order</title></rect><text x="448" y="230" text-anchor="middle" class="chartlet-flow-label">Order</text><line x1="384" y1="236" x2="512" y2="236" class="chartlet-flow-inner"/><text x="396" y="253" text-anchor="start" class="chartlet-class-member">+ id: Int</text><text x="396" y="268" text-anchor="start" class="chartlet-class-member">+ placedAt: Date</text><line x1="384" y1="278" x2="512" y2="278" class="chartlet-flow-inner"/><text x="396" y="295" text-anchor="start" class="chartlet-class-member">+ total(): Money</text></g><rect x="152" y="420" width="592" height="144" class="chartlet-flow-group"/><text x="160" y="433" text-anchor="start" class="chartlet-flow-group-label">Billing</text><g class="chartlet-f chartlet-f-2 chartlet-f-3"><polyline points="308,500 376,500" class="chartlet-flow-edge"><title>Invoice → InvoiceLine: lists</title></polyline><text x="368" y="492" text-anchor="start" class="chartlet-flow-card">1..*</text><polyline points="292,500 300,495 308,500 300,505 292,500" class="chartlet-flow-head chartlet-flow-solid"/><text x="316" y="492" text-anchor="start" class="chartlet-flow-card">1</text></g><g class="chartlet-f chartlet-f-3 chartlet-f-4"><polyline points="488,500 596,500" class="chartlet-flow-edge"><title>InvoiceLine → TaxRate: taxed at</title></polyline><text x="588" y="492" text-anchor="start" class="chartlet-flow-card">1</text><text x="496" y="492" text-anchor="start" class="chartlet-flow-card">*</text></g><g class="chartlet-f chartlet-n-2 chartlet-f-1 chartlet-f-2 chartlet-f-3 chartlet-f-5"></g><g class="chartlet-f chartlet-n-3 chartlet-f-2 chartlet-f-3 chartlet-f-4"></g><g class="chartlet-f chartlet-n-4 chartlet-f-3 chartlet-f-4"></g><g class="chartlet-f chartlet-f-2 chartlet-f-3"><rect x="296" y="475" width="37.36" height="21" class="chartlet-diagram-chip"/><text x="301" y="489" text-anchor="start" class="chartlet-diagram-chip-text">lists</text></g><g class="chartlet-f chartlet-f-3 chartlet-f-4"><rect x="492" y="475" width="60.88" height="21" class="chartlet-diagram-chip"/><text x="497" y="489" text-anchor="start" class="chartlet-diagram-chip-text">taxed at</text></g><g class="chartlet-f chartlet-n-2 chartlet-f-1 chartlet-f-2 chartlet-f-3 chartlet-f-5"><rect x="164" y="450.5" width="128" height="104" class="chartlet-diagram-shadow"/><rect x="164" y="448" width="128" height="104" class="chartlet-flow-node chartlet-role-blue chartlet-class"><title>Invoice</title></rect><text x="228" y="474" text-anchor="middle" class="chartlet-flow-label">Invoice</text><line x1="164" y1="480" x2="292" y2="480" class="chartlet-flow-inner"/><text x="176" y="497" text-anchor="start" class="chartlet-class-member">+ number: String</text><text x="176" y="512" text-anchor="start" class="chartlet-class-member">+ issuedAt: Date</text><line x1="164" y1="522" x2="292" y2="522" class="chartlet-flow-inner"/><text x="176" y="539" text-anchor="start" class="chartlet-class-member">+ total(): Money</text></g><g class="chartlet-f chartlet-n-3 chartlet-f-2 chartlet-f-3 chartlet-f-4"><rect x="376" y="462.5" width="112" height="80" class="chartlet-diagram-shadow"/><rect x="376" y="460" width="112" height="80" class="chartlet-flow-node chartlet-role-blue chartlet-class"><title>InvoiceLine</title></rect><text x="432" y="486" text-anchor="middle" class="chartlet-flow-label">InvoiceLine</text><line x1="376" y1="492" x2="488" y2="492" class="chartlet-flow-inner"/><text x="388" y="509" text-anchor="start" class="chartlet-class-member">+ quantity: Int</text><text x="388" y="524" text-anchor="start" class="chartlet-class-member">+ net: Money</text></g><g class="chartlet-f chartlet-n-4 chartlet-f-3 chartlet-f-4"><rect x="596" y="462.5" width="136" height="80" class="chartlet-diagram-shadow"/><rect x="596" y="460" width="136" height="80" class="chartlet-flow-node chartlet-role-blue chartlet-class"><title>TaxRate</title></rect><text x="664" y="486" text-anchor="middle" class="chartlet-flow-label">TaxRate</text><line x1="596" y1="492" x2="732" y2="492" class="chartlet-flow-inner"/><text x="608" y="509" text-anchor="start" class="chartlet-class-member">+ code: String</text><text x="608" y="524" text-anchor="start" class="chartlet-class-member">+ percent: Decimal</text></g><g class="chartlet-f chartlet-n-5 chartlet-f-2 chartlet-f-5"><rect x="392" y="662.5" width="112" height="80" class="chartlet-diagram-shadow"/><rect x="392" y="660" width="112" height="80" class="chartlet-flow-node chartlet-role-blue chartlet-class"><title>Reminder</title></rect><text x="448" y="686" text-anchor="middle" class="chartlet-flow-label">Reminder</text><line x1="392" y1="692" x2="504" y2="692" class="chartlet-flow-inner"/><text x="404" y="709" text-anchor="start" class="chartlet-class-member">+ level: Int</text><text x="404" y="724" text-anchor="start" class="chartlet-class-member">+ sentAt: Date</text></g></svg><label class="chartlet-hotspot" id="chartlet-6dde3ab5de8f2092-hs-0" for="chartlet-6dde3ab5de8f2092-focus-0"></label><label class="chartlet-hotspot" id="chartlet-6dde3ab5de8f2092-hs-1" for="chartlet-6dde3ab5de8f2092-focus-1"></label><label class="chartlet-hotspot" id="chartlet-6dde3ab5de8f2092-hs-2" for="chartlet-6dde3ab5de8f2092-focus-2"></label><label class="chartlet-hotspot" id="chartlet-6dde3ab5de8f2092-hs-3" for="chartlet-6dde3ab5de8f2092-focus-3"></label><label class="chartlet-hotspot" id="chartlet-6dde3ab5de8f2092-hs-4" for="chartlet-6dde3ab5de8f2092-focus-4"></label><label class="chartlet-hotspot" id="chartlet-6dde3ab5de8f2092-hs-5" for="chartlet-6dde3ab5de8f2092-focus-5"></label></div><p class="chartlet-source">Source: Illustrative domain model</p><details class="chartlet-data" data-viz-text><summary>Show chart data</summary><table><caption>Data for Orders and their invoices</caption><thead><tr><th scope="col">Item</th><th scope="col">Kind</th><th scope="col">Package</th><th scope="col">Attributes</th><th scope="col">Methods</th><th scope="col">Relations</th></tr></thead><tbody><tr><th scope="row">Customer</th><td>Class</td><td>Sales</td><td>+ id: Int; + name: String</td><td></td><td>is associated with Order (1 : 0..*) [places]</td></tr><tr><th scope="row">Order</th><td>Class</td><td>Sales</td><td>+ id: Int; + placedAt: Date</td><td>+ total(): Money</td><td>is associated with Invoice (1 : 1..*) [billed as]</td></tr><tr><th scope="row">Invoice</th><td>Class</td><td>Billing</td><td>+ number: String; + issuedAt: Date</td><td>+ total(): Money</td><td>is composed of InvoiceLine (1 : 1..*) [lists]; is associated with Reminder (1 : 0..3) [dunned by]</td></tr><tr><th scope="row">InvoiceLine</th><td>Class</td><td>Billing</td><td>+ quantity: Int; + net: Money</td><td></td><td>is associated with TaxRate (* : 1) [taxed at]</td></tr><tr><th scope="row">TaxRate</th><td>Class</td><td>Billing</td><td>+ code: String; + percent: Decimal</td><td></td><td></td></tr><tr><th scope="row">Reminder</th><td>Class</td><td></td><td>+ level: Int; + sentAt: Date</td><td></td><td></td></tr></tbody></table></details></figure></div>