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-<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Model families · GATlab.jl</title><script data-outdated-warner src="../../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL="../.."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="../../assets/documenter.js"></script><script src="../../siteinfo.js"></script><script src="../../../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../../assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../../assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="../../assets/themeswap.js"></script></head><body><div id="documenter"><nav class="docs-sidebar"><div class="docs-package-name"><span class="docs-autofit"><a href="../../">GATlab.jl</a></span></div><form class="docs-search" action="../../search/"><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="../../">GATlab.jl</a></li><li><span class="tocitem">Concepts</span><ul><li><a class="tocitem" href="../overview/">For Catlab users</a></li><li><a class="tocitem" href="../theories/">Theories</a></li><li class="is-active"><a class="tocitem" href>Model families</a></li></ul></li><li><a class="tocitem" href="../../api/">Library Reference</a></li><li><a class="tocitem" href="../../stdlib/">Standard Library</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li><a class="is-disabled">Concepts</a></li><li class="is-active"><a href>Model families</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>Model families</a></li></ul></nav><div class="docs-right"><a class="docs-edit-link" href="https://github.com/AlgebraicJulia/GATlab.jl/blob/main/docs/src/concepts/models.md" title="Edit on GitHub"><span class="docs-icon fab"></span><span class="docs-label is-hidden-touch">Edit on GitHub</span></a><a class="docs-settings-button fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article class="content" id="documenter-page"><h1 id="Model-families"><a class="docs-heading-anchor" href="#Model-families">Model families</a><a id="Model-families-1"></a><a class="docs-heading-anchor-permalink" href="#Model-families" title="Permalink"></a></h1><p>The semantics part of GATlab is the <em>model family</em> infrastructure.</p><p>Given a theory, one can declare a model family for that theory. This consists of the following.</p><ol><li><p>A struct <code>T</code>. Each value of the struct is a <em>model</em> of the theory. The struct subtypes <code>Model{Th, Tuple{Ts...}}</code>. <code>Th</code> is the theory that the struct is a model family for, and <code>Ts</code> specifies types for each of the type constructors in <code>Theory</code>.</p></li><li><p>For each type constructor <code>i</code> in <code>Theory</code>, an overload of <code>checkvalidity</code> of the form</p><pre><code class="language-julia hljs">checkvalidity(m::T, ::TypCon{i}, args..., val) = ...</code></pre><p>This checks that <code>val</code> is a valid instance of <code>i</code> applied to <code>args...</code>, assuming that <code>args...</code> have been previously checked to be valid.</p><p>This can then be applied using, for instance</p><pre><code class="language-julia hljs">checkvalidity(m, Category.Hom, x, y, f)</code></pre><p>using the singleton structs defined in <a href="../theories/#Theories">Theories</a></p></li><li><p>For each term constructor <code>i</code> in <code>Theory</code>, an overload of <code>ap</code> of the form</p><pre><code class="language-julia hljs">ap(m::T, ::TrmCon{i}, args...) = ...</code></pre><p>Here <code>args...</code> is to be interpreted as elements of the full context of the term constructor, not just the direct arguments of the term constructor itself. The reason for this is that the implementation of <code>ap</code> might need the data of, say, the domain and codomain of morphisms in order to compose them, and because we have an indexed form of dependent types, this information is not available from the morphism data itself.</p></li></ol></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../theories/">« Theories</a><a class="docs-footer-nextpage" href="../../api/">Library Reference »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.25 on <span class="colophon-date" title="Monday 11 September 2023 22:11">Monday 11 September 2023</span>. Using Julia version 1.9.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
+<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Model families · GATlab.jl</title><script data-outdated-warner src="../../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL="../.."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="../../assets/documenter.js"></script><script src="../../siteinfo.js"></script><script src="../../../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../../assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../../assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="../../assets/themeswap.js"></script></head><body><div id="documenter"><nav class="docs-sidebar"><div class="docs-package-name"><span class="docs-autofit"><a href="../../">GATlab.jl</a></span></div><form class="docs-search" action="../../search/"><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="../../">GATlab.jl</a></li><li><span class="tocitem">Concepts</span><ul><li><a class="tocitem" href="../overview/">For Catlab users</a></li><li><a class="tocitem" href="../theories/">Theories</a></li><li class="is-active"><a class="tocitem" href>Model families</a></li></ul></li><li><a class="tocitem" href="../../api/">Library Reference</a></li><li><a class="tocitem" href="../../stdlib/">Standard Library</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li><a class="is-disabled">Concepts</a></li><li class="is-active"><a href>Model families</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>Model families</a></li></ul></nav><div class="docs-right"><a class="docs-edit-link" href="https://github.com/AlgebraicJulia/GATlab.jl/blob/main/docs/src/concepts/models.md" title="Edit on GitHub"><span class="docs-icon fab"></span><span class="docs-label is-hidden-touch">Edit on GitHub</span></a><a class="docs-settings-button fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article class="content" id="documenter-page"><h1 id="Model-families"><a class="docs-heading-anchor" href="#Model-families">Model families</a><a id="Model-families-1"></a><a class="docs-heading-anchor-permalink" href="#Model-families" title="Permalink"></a></h1><p>The semantics part of GATlab is the <em>model family</em> infrastructure.</p><p>Given a theory, one can declare a model family for that theory. This consists of the following.</p><ol><li><p>A struct <code>T</code>. Each value of the struct is a <em>model</em> of the theory. The struct subtypes <code>Model{Th, Tuple{Ts...}}</code>. <code>Th</code> is the theory that the struct is a model family for, and <code>Ts</code> specifies types for each of the type constructors in <code>Theory</code>.</p></li><li><p>For each type constructor <code>i</code> in <code>Theory</code>, an overload of <code>checkvalidity</code> of the form</p><pre><code class="language-julia hljs">checkvalidity(m::T, ::TypCon{i}, args..., val) = ...</code></pre><p>This checks that <code>val</code> is a valid instance of <code>i</code> applied to <code>args...</code>, assuming that <code>args...</code> have been previously checked to be valid.</p><p>This can then be applied using, for instance</p><pre><code class="language-julia hljs">checkvalidity(m, Category.Hom, x, y, f)</code></pre><p>using the singleton structs defined in <a href="../theories/#Theories">Theories</a></p></li><li><p>For each term constructor <code>i</code> in <code>Theory</code>, an overload of <code>ap</code> of the form</p><pre><code class="language-julia hljs">ap(m::T, ::TrmCon{i}, args...) = ...</code></pre><p>Here <code>args...</code> is to be interpreted as elements of the full context of the term constructor, not just the direct arguments of the term constructor itself. The reason for this is that the implementation of <code>ap</code> might need the data of, say, the domain and codomain of morphisms in order to compose them, and because we have an indexed form of dependent types, this information is not available from the morphism data itself.</p></li></ol></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../theories/">« Theories</a><a class="docs-footer-nextpage" href="../../api/">Library Reference »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.25 on <span class="colophon-date" title="Wednesday 13 September 2023 16:50">Wednesday 13 September 2023</span>. Using Julia version 1.9.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>