...
| Code Block | ||
|---|---|---|
| ||
source : {
...
structuredAnalysis : {
docGeo : {"lat":"$metadata.latitude","lon":"$metadata.longitude"},
description : "$metadata.reportdatetime: $metadata.offense,$metadata.method was
reported at: $metadata.blocksiteaddress",
entities : [
{disambiguous_name:"$metadata.offense,$metadata.method", dimension:"What",
type:"CriminalActivity"},
{disambiguous_name:"$metadata.blocksiteaddress,$metadata.city,$metadata.state",
dimension:"Where",type:"Place", geotag: {latitude:"$metadata.latitude",
longitude:"$metadata.longitude"}}],
events : [
{entity1:"$metadata.offense,$metadata.method",verb:"reported",verb_category:"crime",
time_start:"$metadata.reportdatetime","geo_index" : "Location",
geotag: {latitude:"$metadata.latitude",longitude:"$metadata.longitude"} }]
}
...
} |
Using the $ Operator to Extract Document Data
When structured data is extracted from a source (via the File, Database, or other harvester), each field extracted is captured in the Feed.metadata object. Within the Structured Analysis Harvester data stored in the Metadata object can be access using the $ operator to signify that we are attempting to retrieve data from a field in our document. For example, in the document above you can extract the Offense field using the following syntax:
| Code Block |
|---|
$metadata.offense
|
Note: When data is extracted and added to the Metadata object all field name are converted to lowercase.
For more information on the StructuredAnalysis object and please read the following documents:
...