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<div class="CHAPTER">
<h1>
<a name="XMLSEC-NOTES-STRUCTURE"></a>XML Security Library Structure.</h1>
<p>In order to provide the an ability to use different crypto engines,
the XML Security Library is splitted in two parts: core library (xmlsec)
and crypto library (xmlsec-openssl, xmlsec-gnutls, xmlsec-nss, ...).
</p>
<div class="FIGURE">
<a name="AEN28"></a><p><b>Figure 1. The library structure and dependencies.</b></p>
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<p>The core library has no dependency on any crypto library and provides
implementation of all the engines as well as support for all the non
crypto transforms (xml parser, c14n transforms, xpath and xslt
transforms,...). The XML Security Crypto library provides
implementations for crypto transforms, crypto keys data and key
data stores. Application is linked with particular XML Security
Crypto library (or even libraries), but the actual application
code might be general enough so switching crypto engine would be
a matter of changing several #include directives.</p>
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