The term Brahmana does not refer to a city in Indonesia. Based on the provided source material, it refers to Vedic śruti works associated with the Samhitas of the Rig, Sama, Yajur, and Atharva Vedas. These texts serve as a secondary layer or classification of Sanskrit literature embedded within each Veda.
The primary function of Brahmana literature is to explain and provide instructions on the performance of Vedic rituals, including the symbolism and meaning of the Samhitas. Additionally, these works expound on scientific knowledge from the Vedic Period, specifically observational astronomy and geometry related to altar construction. Some Brahmanas also contain mystical and philosophical material that constitutes Aranyakas and Upanishads.