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   <div id="projectname">Strong4VM<span id="projectnumber">&#160;1.0.0</span>
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   <div id="projectbrief">A tool for extracting Strong Transitive Dependency and Conflict Graphs from Variability Models</div>
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  <div class="headertitle"><div class="title">Strong4VM Documentation </div></div>
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<p><em>A tool for extracting Strong Transitive Dependency and Conflict Graphs from Variability Models</em></p>
<h1><a class="anchor" id="autotoc_md30"></a>
Welcome</h1>
<p>Welcome to the Strong4VM documentation! Strong4VM is a comprehensive toolchain for analyzing feature model dependencies and conflicts through SAT-based backbone detection.</p>
<p>Variability models specify configurable options (features) along with their constraints. However, these constraints create numerous indirect relationships through chaining. <b>Strong4VM identifies all transitive strong relationships</b> between features and represents them as graphs. The term <em>transitive</em> refers to relationships formed by linking other relationships, while <em>strong</em> indicates validity in all configurations that comply with the variability model.</p>
<h1><a class="anchor" id="autotoc_md31"></a>
Quick Links</h1>
<ul>
<li><a class="el" href="getting_started.html">Getting Started</a> - Installation and first steps</li>
<li><a class="el" href="architecture.html">Architecture Overview</a> - System design and components</li>
<li><a class="el" href="examples.html">Usage Examples</a> - Common usage patterns</li>
<li><a class="el" href="limitations.html">Limitations</a> - Known limitations and troubleshooting</li>
<li><a href="modules.html">API Reference</a> - Complete API documentation</li>
</ul>
<h1><a class="anchor" id="autotoc_md32"></a>
Key Features</h1>
<ul>
<li><b>🎯 Unified Interface</b>: Single tool for UVL or DIMACS inputs</li>
<li><b>⚡ High Performance</b>: Multi-threaded graph generation with configurable parallelism</li>
<li><b>📈 Comprehensive</b>: Generates requires/excludes graphs and core/dead feature lists</li>
<li><b>✅ Well-tested</b>: Validated against <a href="https://doi.org/10.5281/zenodo.17277788">5,709 real-world variability models</a></li>
</ul>
<h1><a class="anchor" id="autotoc_md33"></a>
Components</h1>
<p>Strong4VM consists of three integrated components forming a complete analysis pipeline:</p>
<ol type="1">
<li><b>UVL2Dimacs</b> - Converts UVL feature models to DIMACS CNF format<ul>
<li>ANTLR4-based parser for Universal Variability Language</li>
<li>Two transformation modes: Straightforward and Tseitin</li>
<li>Efficient CNF encoding of feature relationships</li>
</ul>
</li>
<li><b>Dimacs2Graphs</b> - Generates strong transitive graphs from CNF formulas<ul>
<li>Multi-threaded parallel processing</li>
<li>SAT-based analysis for dependency and conflict detection</li>
<li>Produces Pajek .net graph files</li>
</ul>
</li>
<li><b>BoneDigger</b> - High-performance backbone detection engine<ul>
<li>Three detection strategies: CheckCandidatesOneByOne, FastOnCliffsSlowOnPlains, RushAndPray</li>
<li>Identifies core (always enabled) and dead (never enabled) features</li>
<li>Also used for backbone simplification of UVL-converted formulas</li>
<li>MiniSat-based implementation</li>
</ul>
</li>
</ol>
<p>See the <a class="el" href="architecture.html">Architecture</a> page for detailed design information.</p>
<h1><a class="anchor" id="autotoc_md34"></a>
Pipeline Overview</h1>
<div class="fragment"><div class="line">UVL Feature Model  →  [UVL2Dimacs + BackboneSimplifier]  →  Simplified DIMACS  →  [Dimacs2Graphs + BoneDigger]  →  Graphs</div>
</div><!-- fragment --><h1><a class="anchor" id="autotoc_md35"></a>
Output Files</h1>
<p>For input file <code>model.uvl</code> or <code>model.dimacs</code>, Strong4VM generates:</p>
<ul>
<li><code>model__requires.net</code> - Strong transitive dependency graph (directed, Pajek format)</li>
<li><code>model__excludes.net</code> - Strong transitive conflict graph (undirected, Pajek format)</li>
<li><code>model__core.txt</code> - Core features (enabled in all configurations)</li>
<li><code>model__dead.txt</code> - Dead features (disabled in all configurations)</li>
</ul>
<h1><a class="anchor" id="autotoc_md36"></a>
Getting Help</h1>
<ul>
<li>See <a class="el" href="getting_started.html">Getting Started with Strong4VM</a> for installation and basic usage</li>
<li>Check <a class="el" href="examples.html">Strong4VM Usage Examples</a> for common usage patterns</li>
<li>Review <a class="el" href="limitations.html">Known Limitations and Troubleshooting</a> for troubleshooting</li>
<li>Visit the <a href="https://github.com/rheradio/Strong4VM">GitHub repository</a> for issues and updates</li>
</ul>
<h1><a class="anchor" id="autotoc_md37"></a>
License</h1>
<p>Strong4VM is released under the MIT License. It is built upon:</p><ul>
<li><b>MiniSat</b>: MIT License</li>
<li><b>ANTLR4</b>: BSD License</li>
</ul>
<h1><a class="anchor" id="autotoc_md38"></a>
Authors</h1>
<ul>
<li>Ruben Heradio, <a href="#" onclick="location.href='mai'+'lto:'+'rhe'+'ra'+'dio'+'@i'+'ssi'+'.u'+'ned'+'.e'+'s'; return false;">rhera<span class="obfuscator">.nosp@m.</span>dio@<span class="obfuscator">.nosp@m.</span>issi.<span class="obfuscator">.nosp@m.</span>uned<span class="obfuscator">.nosp@m.</span>.es</a></li>
<li>Luis Cambelo, <a href="#" onclick="location.href='mai'+'lto:'+'lca'+'mb'+'elo'+'1@'+'alu'+'mn'+'o.u'+'ne'+'d.e'+'s'; return false;">lcamb<span class="obfuscator">.nosp@m.</span>elo1<span class="obfuscator">.nosp@m.</span>@alum<span class="obfuscator">.nosp@m.</span>no.u<span class="obfuscator">.nosp@m.</span>ned.e<span class="obfuscator">.nosp@m.</span>s</a></li>
<li>Miguel A. Olivero, <a href="#" onclick="location.href='mai'+'lto:'+'mol'+'iv'+'ero'+'@u'+'s.e'+'s'; return false;">moliv<span class="obfuscator">.nosp@m.</span>ero@<span class="obfuscator">.nosp@m.</span>us.es</a></li>
<li>José Manuel Sánchez Ruiz, <a href="#" onclick="location.href='mai'+'lto:'+'jsa'+'nc'+'hez'+'7@'+'us.'+'es'; return false;">jsanc<span class="obfuscator">.nosp@m.</span>hez7<span class="obfuscator">.nosp@m.</span>@us.e<span class="obfuscator">.nosp@m.</span>s</a></li>
<li>Alberto Pérez García-Plaza, <a href="#" onclick="location.href='mai'+'lto:'+'alb'+'er'+'to.'+'pe'+'rez'+'@l'+'si.'+'un'+'ed.'+'es'; return false;">alber<span class="obfuscator">.nosp@m.</span>to.p<span class="obfuscator">.nosp@m.</span>erez@<span class="obfuscator">.nosp@m.</span>lsi.<span class="obfuscator">.nosp@m.</span>uned.<span class="obfuscator">.nosp@m.</span>es</a></li>
<li>David Fernández Amorós, <a href="#" onclick="location.href='mai'+'lto:'+'dav'+'id'+'@is'+'si'+'.un'+'ed'+'.es'; return false;">david<span class="obfuscator">.nosp@m.</span>@iss<span class="obfuscator">.nosp@m.</span>i.une<span class="obfuscator">.nosp@m.</span>d.es</a></li>
</ul>
<h1><a class="anchor" id="autotoc_md39"></a>
Funding</h1>
<p>This work is funded by FEDER/Spanish Ministry of Science, Innovation and Universities (MCIN)/Agencia Estatal de Investigacion (AEI) under project COSY (PID2022-142043NB-I00). </p>
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