MOM-CA uses and in some parts extends the [eXist application server](http://exist-db.org/). The source code extending or patching eXist is located under [my/eXist](../tree/master/my/eXist). eXist provides an interface to write custom XQuery modules extending the function library. Following this , MOM-CA implements a custom XQuery modules:
MOM-CA uses and in some parts extends the [eXist application server](http://exist-db.org/). The source code extending or patching eXist is located under [my/eXist](../tree/master/my/eXist). eXist provides an interface to write custom XQuery modules extending the function library. Following this , MOM-CA implements three new XQuery modules:
* an Excel module for the conversion of Excel sheets into XML
* an XQuery Excel module for the conversion of Excel sheets into XML
* a text difference module which forms the basis to compare
* an XQuery text difference module which forms the basis to compare
* an XQuery minify module to minify JavaScript and CSS resources
All these XQuery modules are located under [my/eXist/extensions/module/src](../tree/master/my/eXist/extensions/module/src).
All these XQuery modules are located under [my/eXist/extensions/module/src](../tree/master/my/eXist/extensions/module/src). Besides these new modules, there are patches and extensions implemented for some existing eXist XQuery modules:
* The eXist SQL module is extended with the possibility to
