Abstract: The present invention extends to methods, systems, and computer program products for the facilitating the layout and composition of graphics. Embodiments of the present invention allow declarative input for creation and modification of layout compositions and also allows adjustments or modifications made to layout compositions. Layout compositions may be created, adjusted, and modified by input through a markup language or by user-commands and gestures. Relationships and associations among nodes and among line segments and connections between nodes which are embodied within a composition or created by an auto layout are preserved both during and after adjustments and modifications.

Abstract: Embodiments are directed to generating declarative model editors. A computer system receives a first user input indicating a selection of a native underlying schema that includes constraints that are to be followed by models based on the native schema. The computer system receives a second user input indicating a declarative entry that includes user-configurable model editor characteristics. The computer system automatically generates a declarative model editor based on the selected native schema and user-configurable model editor characteristics. Other embodiments are directed to editing models using declarative model editors. A computer system receives user input indicating a declarative entry to be applied to a model, generates a declarative model editor based on the declarative entry, receives a model that is editable by the generated declarative model editor, and edits user-configurable characteristics of the model. The model characteristics conform to the constraints in the native underlying schema.