For all kindergartens in the state of Niedersachsen, the "Orientation plan for education and upbringing" applies (https://www.mk.niedersachsen.de/startseite/fruehkindliche_bildung/orientierungsplan/orientierungsplan-fuer-bildung-und-erziehung-86998.html).
Information for parents on the orientation plan in Niedersachsen can be found at https://www.mk.niedersachsen.de/download/4492/Elterninformation_Orientierungsplan_fuer_Bildung_und_Erziehung_.pdf
The German federal states have developed education plans (curricula) that implement the educational standards in the individual school subjects. The education plans define the subject-related requirements (learning content) and describe the competencies to be achieved (learning goals). On basis of the education plans, the schools develop their own curricula for the subjects.
The education plans for schools in Niedersachsen can be found at: http://nline.nibis.de/cuvo/menue/nibis.phtml?menid=116&PHPSESSID=aecf535165df6efd75ff1984d3e02d08