Assertion: coordinate's application | /r/CapableOf | start the matrix
Facets:
value: at the top of each stack
type: LOCATION
Source sentences:
text: In legacy OpenGL (i.e., versions before OpenGL 3.1, or using compatibility profiles), two matrix stacks are defined: model-view, and projection, and when an application starts the matrix at the top of each stack is an identity matrix (1.0 on the diagonal, 0.0 for all other elements).