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    <p>There are various data persistence libraries for Lua as well, many are described at the <a href="http://lua-users.org/wiki/" rel="nofollow noreferrer">Lua user's wiki</a>. The <a href="http://lua-users.org/wiki/LuaXml" rel="nofollow noreferrer">page on XML</a> has information that could help.</p> <p><strike>The nice folks over at the <a href="https://www.keplerproject.org/" rel="nofollow noreferrer">Kepler project</a> have generators for HTML which can be used for generating valid XML.</strike> (Dead link.)</p> <p>There is also <a href="http://cosmo.luaforge.net/" rel="nofollow noreferrer">cosmo</a> which is a generalized template framework that can be used to generate XML (among other things).</p> <p><strong>Edit:</strong></p> <p>I understand the concern for templates not necessarily providing guarantees that the output remains well formed. I'm pretty sure that the authors of Cosmo would be unhappy if a well-formed template ever produced a mal-formed document, but there is still the issue of properly quoting the content. In the contexts where I've used it, this hasn't been an issue for me, but I also haven't been working from untrusted source text.</p> <p>There are also projects posted at LuaForge that may be useful:</p> <ul> <li><p><a href="http://luaforge.net/projects/etree/" rel="nofollow noreferrer">Lua Element Tree</a> maps an XML document to and from a tree of tables. It uses Expat for reading, and claims to generate valid XML when writing.</p></li> <li><p><a href="http://luaforge.net/projects/luasoap/" rel="nofollow noreferrer">LuaSOAP</a> Includes XML generation and parsing sufficient for SOAP transactions. If you decide to write your own generator, this might be a good starting point for a limited dialect such as RSS or ATOM.</p></li> </ul> <p>Also, I know I've seen a project that implemented a complete DOM for HTML documents and supported both parsing and document generation, but I can't remember its name or locate it today at LuaForge.</p> <p><strong>Edit 2:</strong> Here's another package that I hadn't noticed before, even though it is included in <a href="http://luaforwindows.luaforge.net/" rel="nofollow noreferrer">Lua for Windows</a>: <a href="http://www.viremo.de/LuaXML/" rel="nofollow noreferrer">LuaXML</a>. It maps between XML and nest of Lua tables, and can both read and write XML.</p>
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    1. POSafely generating XML in Lua
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    1. COThanks for the response. Unfortunately, templating systems (like Cosmo) aren't any safer or easier than generating by hand -- I'd like something that might help me generate well-formed XML. Something that can guarantee well-formedness would be even better. I also don't see any XML generation libraries on lua-users.org or as part of Kepler -- luaexpat (http://www.keplerproject.org/luaexpat/) is just for parsing and the libxml2 bindings seem to have vanished.
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    2. COI added a couple of links to LuaForge projects that also approach your needs. I haven't spotted a perfect solution, however.
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    3. COThanks for the specifics! I'll definitely investigate both of these.
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