TIGER API is a library which allows Java programmers to easily access the structure of any corpus given as a TIGER-XML file. It can process the TIGER corpus and any other corpus encoded in TIGER-XML. The underlying API specifies a Java object model for corpora encoded in TIGER-XML and provides methods for traversing syntax trees and accessing elements such as sentences, syntax graph nodes, and their attributes. The provided parser processes a given TIGER-XML file, builds according data structures representing all structural aspects of the corpus and renders a Java Corpus object. This Corpus object represents the given corpus and its structures and serves as an entry point for accessing its syntax trees, its nodes and their attributes.