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| <html> |
| <head> |
| <title>Text Common Annotation System (TCAS) Interfaces</title> |
| </head> |
| |
| <body> |
| Text Common Annotation System (TCAS) Interfaces. |
| <p> |
| |
| The TCAS defines some convenience APIs for using the basic CAS system for |
| text analysis. It defines the notion of a document, and of annotations |
| spanning parts of documents. It also provides a standard way of ordering |
| annotations, and an annotation index with respect to that ordering. |
| </p> |
| <p>With the Sofa related extensions, a TCAS is now a "view" of a CAS tied to |
| a Sofa in the CAS. Most of the CAS structures in a <code>TCAS</code> are references to |
| those in the "base CAS" from which it was instantiated. Each TCAS contains the Sofa it is tied to |
| and a Index Repository that is distinct from the Index Repository in the "base CAS". |
| </p> |
| <p>The standard sequence for annotations is as follows. If annotation a1 starts |
| before annotation a2, then a1 is smaller than a2. If a1 and a2 start at the same |
| place and a2 ends before a1, then also a1 is smaller than a2. If a1 and a2 start |
| and end at the same place, then they are currently considered to be equal, and their |
| sequence in the index is undefined. |
| </p> |
| </body> |
| </html> |
