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The default schema mapper maps nested properties to attribute names using the dot-notation, so, for example, a collection containing documents with the following
structure:
would correspond to a schema with three attributes, "data.intProperty", "data.doubleProperty" and "data.stringProperty". This however raises issues when a CQL filter on the attribute is added to e.g. a WMS request, because the attribute name is translated to an XPath _expression_ and thus the dots (.) become forward slashes (/) and attribute lookup fails.
Similarly, if the field name in mongo contains a colon (:), WFS will generate invalid XML, since the XML element corresponding to such attribute will contain a colon character after the namespace separator.
E.g., field "xsi:type" would become in XML <[namespace]:xsi:type>, which is invalid.
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