This schema specifies model components for describing neurons. These are fairly abstract and mainly meant to serve as placeholders / bases for extension. Included are: - neuron - invertebrate neuron - mammalian neuron Note: canonical location of the 'xml' schema is "http://www.w3.org/2001/xml.xsd", however sometimes this server is down or slow, so we use a local copy. Neurotransmitter used by neuron. Synaptic receptor expressed by neuron. Superclass for neuron recording sources; do not use directly. Recording source, specialized to invertebrate neurons. Canonical invertebrate neuron identifier. Recording source, specialized to mammalian neurons. Spontaneous firing rate of the Neuron, in Hz. Firing characteristics of Neuron when driven by stimulus or controlling action.