...
- Retrieve the parent of a fragment given an
- A fragmentan xpath (this a a regular get , not really a query)
1.4.2 Model instance fragment queries (anchor point)
...
- Retrieve all the fragments under an anchor point given a
- anchor point (with level restriction!)
1.4.4 Type Query
A system or human user should be able to extract all the fragments that match a dataspace and a schema node identifier.
...
- Retrieve all the relevant fragments given an
- Dataspace
- Schema node identifier
2 Database backend
...
The proposed DB for this schema is Postgres (as it uses some Postgres specific datatypes)
Note the module_set table above will not be used like this in the PoC instead we will start with a ‘modules’ table which will contain the complete source for each module. Including colums for namespace and revision.
2.2.1 Schema Code
| Code Block | ||||||||
|---|---|---|---|---|---|---|---|---|
| ||||||||
CREATE TABLE RELATION_TYPE
(
RELATION_TYPE TEXT NOT NULL,
ID SERIAL PRIMARY KEY
);
CREATE TABLE DATASPACE
(
ID SERIAL PRIMARY KEY,
NAME TEXT NOT NULL,
CONSTRAINT "UQ_NAME" UNIQUE (NAME)
);
CREATE TABLE SCHEMA_NODE
(
SCHEMA_NODE_IDENTIFIER TEXT NOT NULL,
ID SERIAL PRIMARY KEY
);
CREATE TABLE MODULE_SET
(
MODULE_SET_REFERENCE TEXT NOT NULL,
ID SERIAL PRIMARY KEY
);
CREATE TABLE FRAGMENT
(
ID BIGSERIAL PRIMARY KEY,
XPATH TEXT NOT NULL,
DATASPACE_ID INTEGER NOT NULL REFERENCES DATASPACE(ID),
ATTRIBUTES JSONB,
ANCHOR_ID BIGINT REFERENCES FRAGMENT(ID),
PARENT_ID BIGINT REFERENCES FRAGMENT(ID),
MODULE_SET_ID INTEGER REFERENCES MODULE_SET(ID),
SCHEMA_NODE_ID INTEGER REFERENCES SCHEMA_NODE(ID)
);
CREATE TABLE RELATION
(
FROM_FRAGMENT_ID BIGINT NOT NULL REFERENCES FRAGMENT(ID),
TO_FRAGMENT_ID BIGINT NOT NULL REFERENCES FRAGMENT(ID),
RELATION_TYPE_ID INTEGER NOT NULL REFERENCES RELATION_TYPE(ID),
FROM_REL_XPATH TEXT NOT NULL,
TO_REL_XPATH TEXT NOT NULL,
CONSTRAINT RELATION_PKEY PRIMARY KEY (TO_FRAGMENT_ID, FROM_FRAGMENT_ID, RELATION_TYPE_ID)
);
CREATE INDEX "FKI_FRAGMENT_DATASPACE_ID_FK" ON FRAGMENT USING BTREE(DATASPACE_ID) ;
CREATE INDEX "FKI_FRAGMENT_MODULE_SET_ID_FK" ON FRAGMENT USING BTREE(MODULE_SET_ID) ;
CREATE INDEX "FKI_FRAGMENT_PARENT_ID_FK" ON FRAGMENT USING BTREE(PARENT_ID) ;
CREATE INDEX "FKI_FRAGMENT_ANCHOR_ID_FK" ON FRAGMENT USING BTREE(ANCHOR_ID) ;
CREATE INDEX "PERF_SCHEMA_NODE_SCHEMA_NODE_ID" ON SCHEMA_NODE USING BTREE(SCHEMA_NODE_IDENTIFIER) ;
CREATE INDEX "FKI_SCHEMA_NODE_ID_TO_ID" ON FRAGMENT USING BTREE(SCHEMA_NODE_ID) ;
CREATE INDEX "FKI_RELATION_TYPE_ID_FK" ON RELATION USING BTREE(RELATION_TYPE_ID);
CREATE INDEX "FKI_RELATIONS_FROM_ID_FK" ON RELATION USING BTREE(FROM_FRAGMENT_ID);
CREATE INDEX "FKI_RELATIONS_TO_ID_FK" ON RELATION USING BTREE(TO_FRAGMENT_ID);
CREATE INDEX "PERF_MODULE_SET_MODULE_SET_REFERENCE" ON MODULE_SET USING BTREE(MODULE_SET_REFERENCE) ;
CREATE UNIQUE INDEX "UQ_FRAGMENT_XPATH"ON FRAGMENT USING btree(xpath COLLATE pg_catalog."default" text_pattern_ops, dataspace_id); |
...