It is ok to follow XSD, no problem in that sense.

Anyway, I'm not referring to that... I'm referring that in the User Manual at https://forge.fi-ware.eu/plugins/mediawiki/wiki/fiware/index.php/Publish/Subscribe_Broker_-_Orion_Context_Broker_-_User_and_Programmers_Guide each piece of XML has to be 100% coherent with what Orion uses in their request or responses. Thus, could you have a look to the `<contextAttributeResponse>` elements in that webpage (probability the ones related with this test harness, i.e. convenience_individual_context_entity_attribute_get) to ensure that the XML are ok according to the changes included in this PR, please? (maybe you have already done that :)