Core class used to implement taxonomy queries for the Taxonomy API.

Constructor.

Validates a single query.

Identify an existing table alias that is compatible with the current query clause.

Generates SQL clauses to be appended to a main query.

Generate SQL clauses to be appended to a main query.

Generate SQL JOIN and WHERE clauses for a “first-order” query clause.

Generate SQL clauses for a single query array.

Determine whether a clause is first-order.

Ensure the ‘tax_query’ argument passed to the class constructor is well-formed.