Even though JSONIX is a well recognized tool, I have discovered it recently, while looking into parsing WFS capabilities document in JS.
Once I had WFS operational, I started looking into WMS Caps parser, so can handle querying OGC services in a unified way regardless the mapping library (ol, leaflet).
It is pretty straight forward, all mappings are here: w3-schemas and ogc-schemas. Some problems will pop-out when a service happens to provide inspire extended capabilities. Using only the standard mappings will not do, jsonix will complain about missing mappings for {http://inspire.ec.europa.eu/schemas/inspire_vs/1.0}ExtendedCapabilities.
In order to get things right, it was required to provided the proper mappings. Luckily schemas are accessible via inspire-schemas one just needs to generate the mappings, as the repo does not provide them. Mapping generator can be obtained from https://github.com/highsource/jsonix-schema-compiler, then it's just a matter of executing the following:
java -jar jsonix-schema-compiler-full.jar -p INSPIRE_VS_1_0 -b inspire-schemas-1.0.0\schemas\src\main\resources\inspire.ec.europa.eu\schemas\inspire_vs\1.0\bindings.xjb -d mappings inspire-schemas-1.0.0\schemas\src\main\resources\inspire.ec.europa.eu\schemas\inspire_vs\1.0\inspire_vs.xsd
If you happen to get the following err:
[ERROR] Property "Title" is already defined. Use <jaxb:property> to resolve this conflict.
line 232 of http://www.w3.org/1999/xlink.xsd
[ERROR] The following location is relevant to the above error
line 219 of http://www.w3.org/1999/xlink.xsd
[ERROR] Property "Title" is already defined. Use <jaxb:property> to resolve this conflict.
line 261 of http://www.w3.org/1999/xlink.xsd
[ERROR] The following location is relevant to the above error
line 246 of http://www.w3.org/1999/xlink.xsd
[ERROR] org.hisrc.jsonix.execution.JsonixInvoker - The model is null, there was probably a problem parsing schemas.
Make sure to include binding for xlink:title
<?xml version="1.0" encoding="UTF-8"?>
<jxb:bindings version="1.0" xmlns:jxb="http://java.sun.com/xml/ns/jaxb" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<jxb:bindings schemaLocation="../../common/1.0/common.xsd" node="//xs:complexType[@name='service']">
<jxb:class name="InspireService"/>
</jxb:bindings>
<jxb:bindings schemaLocation="../../common/1.0/common.xsd" node="//xs:complexType[@name='keyword']">
<jxb:class name="InspireKeyword"/>
</jxb:bindings>
<jxb:bindings schemaLocation="inspire_vs.xsd" node="//xs:element[@name='ExtendedCapabilities']">
<jxb:class name="InspireExtendedCapabilities"/>
</jxb:bindings>
<jxb:bindings scd="x-schema::xlink" xmlns:xlink="http://www.w3.org/1999/xlink">
<jxb:bindings scd="/group::xlink:locatorModel/model::sequence/xlink:title">
<jxb:property name="LocatorTitle"/>
</jxb:bindings>
</jxb:bindings>
</jxb:bindings>