Abstract: A system can generate an expression tree hierarchy based on a database query that refers to dynamic data of a database having a data model. The dynamic data is undefined in the data model of the database. The system can invoke a process that traverses the expression tree hierarchy to transform the expression tree hierarchy and iteratively or recursively translate multiple expression fragments of the expression tree hierarchy in accordance with the process while maintaining a contextual type stack. A particular iteration or recursion operates on a particular expression fragment of the multiple expression fragments to convert the particular expression fragment into another expression fragment for another expression tree hierarchy.

Abstract: A system can generate an expression tree hierarchy based on a database query that refers to dynamic data of a database having a data model. The dynamic data is undefined in the data model of the database. The system can invoke a process that traverses the expression tree hierarchy to transform the expression tree hierarchy and iteratively or recursively translate multiple expression fragments of the expression tree hierarchy in accordance with the process while maintaining a contextual type stack. A particular iteration or recursion operates on a particular expression fragment of the multiple expression fragments to convert the particular expression fragment into another expression fragment for another expression tree hierarchy.

Abstract: A facility for querying user-defined database columns is described. The facility receives a database query referring to one or more database columns, at least one of the referred-to database columns being a user-defined database column. The facility provides access to a database query result generated for the perceived database query via a programmatic object.

Abstract: A facility for defining a calculated distinguished database field is described. The facility receives a formula usable to calculate the value of the distinguished database field for each of a plurality of database rows, the formula expressed as a method in a distinguished procedural programming language. The facility transforms the formula method into a syntax tree for the distinguished procedural programming language. The facility modifies the syntax tree to provide variable context, field projection, runtimetype dynamic property accessors, and/or field path mapping. The facility transforms the modified syntax tree into a second version of the formula method in the distinguished procedural programming language.

Abstract: A facility for querying user-defined database columns is described. The facility receives a database query referring to one or more database columns, at least one of the referred-to database columns being a user-defined database column. The facility provides access to a database query result generated for the perceived database query via a programmatic object.

Abstract: A facility for querying user-defined database columns is described. The facility receives a database query referring to one or more database columns, at least one of the referred-to database columns being a user-defined database column. The facility provides access to a database query result generated for the perceived database query via a programmatic object.

Abstract: A dynamic content system integrates dynamic and static content through entry of physical table and field structures and creating metadata describing the physical structures. A formula engine with a cascading formula detection engine calculates fields, and a dynamic meta-assembly engine dynamically generates code for the dynamic content. A dynamic meta-reporting engine with a dynamic meta-query engine reports content. An access control engine and workflow engine integrate into the dynamic content system to provide content permissions and routing.

Abstract: A facility for querying user-defined database columns is described. The facility receives a database query referring to one or more database columns, at least one of the referred-to database columns being a user-defined database column. The facility provides access to a database query result generated for the perceived database query via a programmatic object.

Abstract: A dynamic content system integrates dynamic and static content through entry of physical table and field structures and creating metadata describing the physical structures. A formula engine with a cascading formula detection engine calculates fields, and a dynamic meta-assembly engine dynamically generates code for the dynamic content. A dynamic meta-reporting engine with a dynamic meta-query engine reports content. An access control engine and workflow engine integrate into the dynamic content system to provide content permissions and routing.

Abstract: A cage for properly positioning replacement valves and bores holds an assembly of a valve member and valve cone in proper relative position during replacement of the valve assembly in the bore of an air compressor.