An attempt to develop utilities for handling large GML-files
The gmlz format is a carefully composed zip-file containing a gml file and an index that can be used when reading the content.
The index is stored as a SQLite database with tables described below.
That's it - about the storage format.
create table xmlns(
signature integer primary key
, uri varchar
);
create table qname(
signature integer primary key
, namespace integer
, localname varchar
);
create table xml_path(
signature integer primary key
, parent_signature integer
, qname integer
);
create table xml_fragment(
position integer primary key
, size integer
, gml_id varchar
, xml_path integer
);
create table compressed_block(
position integer primary key
, size integer
, compressed_position integer
, compressed_size integer
);
| Column | Data type | Description |
|---|---|---|
| gml_id | ||
| path | asdf |