def _parse_tbody_tr(self, table):
raise AbstractMethodError(self)<EOL>
Return the list of tbody row elements from the parsed table element.

HTML5 table bodies consist of either 0 or more <tbody> elements (which
only contain <tr> elements) or 0 or more <tr> elements. This method
checks for both structures.

Parameters
----------
table : a table element that contains row elements.

Returns
-------
list of node-like
    These are the <tr> row elements of a table.