Implementation of backward compatible XML schema evolution
First Claim
1. A method performing a machine-executed operation involving instructions,wherein the machine-executed operation is at least one of:
- A) sending said instructions over transmission media;
B) receiving said instructions over transmission media;
C) storing said instructions onto a machine-readable storage medium; and
D) executing the instructions;
wherein said instructions are instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of;
storing a set of documents associated with a schema in a database, wherein the database includes base database structures corresponding to elements in the set of documents;
modifying the schema;
determining if the set of stored documents in the database is compatible with the modified schema; and
if the set of stored documents in the database is compatible with the modified schema, modifying the database to reflect the changes to the schema.
1 Assignment
0 Petitions
Accused Products
Abstract
In-place XML schema evolution occurs by evaluating an existing XML schema in a database system to see if it is compatible with a new XML schema. To determine if the old schema is compatible with the new schema, a lock-step traversal is performed on the two schemas. Each instruction in the old schema is compared to instructions in the new schema. Detected differences between the two schemas are evaluated to determine if existing XML documents are still compatible with the new schema. If they are, then an in-place schema evolution operation can take place. The in-place schema operation basically, involves appending the updated object information to the underlying object type and preserving the order of elements in a document by storing element mapping information on disk.
93 Citations
22 Claims
-
1. A method performing a machine-executed operation involving instructions,
wherein the machine-executed operation is at least one of: -
A) sending said instructions over transmission media; B) receiving said instructions over transmission media; C) storing said instructions onto a machine-readable storage medium; and D) executing the instructions; wherein said instructions are instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of; storing a set of documents associated with a schema in a database, wherein the database includes base database structures corresponding to elements in the set of documents; modifying the schema; determining if the set of stored documents in the database is compatible with the modified schema; and if the set of stored documents in the database is compatible with the modified schema, modifying the database to reflect the changes to the schema. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A computer-readable storage medium carrying one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the steps of:
-
storing a set of documents associated with a schema in a database, wherein the database includes base database structures corresponding to elements in the set of documents; modifying the schema; determining if the set of stored documents in the database is compatible with the modified schema; and if the set of stored documents in the database is compatible with the modified schema, modifying the database to reflect the changes to the schema. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification