Method has

basex-core/src/main/java/org/basex/query/expr/Expr.java:235–235

Indicates if an expression has one of the specified compiler properties. This method must only be called at compile time. It is invoked to test properties of sub-expressions. It returns true if at least flag matches an expression. @param flags flags to be checked @return result of check

(Flag... flags)

   * @return result of check
   */
  public abstract boolean has(Flag... flags);

  /**
   * Checks if the given variable is used by this expression.