There can be situations where OpenCities Map is showing level, domain list and/or feature names with __x00##__ similar to the following:
This is the result of encoded characters that are illegal in the EC Framework which is the internal storage structure for the non-graphical portion of an element. The recommended workaround is to rename the item in the schema file during the Register Features process using the Geospatial Administrator.
NOTE regarding PostgreSQL (PostGIS)
To avoid __x0022__ (denotes a double quote) in your feature property names, do not use UPPER CASE characters in the column names. For example, the following columns contain upper case characters: Well Name and DEPTH. When registered, each word is wrapped with double quotes which translates to __x0022__.
Using only lower case characters will eliminate the presence of __x0022_ as shown below:
An alternate solution is to edit the XFM Feature Name and Display Name as you register the features.