Update README

README.md

@@ -2,7 +2,9 @@
 A library for skolemising (or canonicalising) blank node labels in RDF graphs.
 
 ## Compilation
-You need [Maven](https://maven.apache.org/) installed
+
+You need [Maven](https://maven.apache.org/) and JDK 8+ installed.
+
 ### To build a .jar
 ```bash
 $ mvn clean package
@@ -13,17 +15,64 @@ $ mvn clean install
 ````
 
 ## Usage
+
 ### CLI
-````bash
+
+To get a list of utilities:
+
+```bash
 $ java -jar blabel-0.2.0-SNAPSHOT-jar-with-dependencies.jar
-````
+usage: cl.uchile.dcc.blabel.cli.Main
+missing <utility> arg where <utility> one of
+	LabelRDFGraph: Run labelling over an RDF graph encoded as N-Triples
+	RunNQuadsTest: [Testing] Compute the canonical graphs in a quads file
+	Control: [Testing] Run a control experiment to time parsing a quads file
+	RunSyntheticEvaluation: [Testing] Run synthetic benchmark
+	AnalyseNQuadsResults: [Testing]
+	UndirectedGraphToRDF: [Testing]
+```
+
+To get help for the main (skolemization) utility:
+
+```bash
+$ java -jar blabel-0.2.0-SNAPSHOT-jar-with-dependencies.jar LabelRDFGraph -h
+***ERROR: class org.apache.commons.cli.MissingOptionException: Missing required options: io
+usage: parameters:
+ -b         output labels as blank nodes
+ -ddp       don't distinguish partitions [isomorphic blank node partitions
+            will be removed; by default they are distinguished and kept]
+ -h         print help
+ -i <arg>   input file [enter 'std' for stdin]
+ -igz       input is GZipped
+ -l         lean beforehand
+ -lo        lean only, do not label
+ -o <arg>   output file [enter 'std' for stdout]
+ -ogz       output should be GZipped
+ -p <arg>   string prefix to append to label [make sure it's valid for URI
+            or blank node!] [default empty string])
+ -s <arg>   hashing scheme: 0:md5 1:murmur3_128 2:sha1 3:sha256 4:sha512
+            (default Hashing.md5())
+ -upp       keep blank nodes unique per partition, not graph [blank nodes
+            are labelled only using information from the partition; by default the
+            entire graph is encoded in the blank node label including ground triples]
+time elapsed 17 ms
+```
+
+To skolemize a file `input.nt` into a file `output.nt`, using a prefix `https://example.com/.well-known/genid/` and the SHA256 hashing algorithm:
+
+```sh
+java -jar target/blabel-0.2.0-SNAPSHOT-jar-with-dependencies.jar LabelRDFGraph \
+   -i input.nt -s 3 -p 'https://example.com/.well-known/genid/' -o output.nt
+```
+
 ### As Maven dependency
-````xml
+
+```xml
 <dependency>
   <groupId>cl.uchile.dcc</groupId>
   <artifactId>blabel</artifactId>
   <version>0.2.0-SNAPSHOT</version>
 </dependency>
-````
+```
 
 See the following page for more details: http://blabel.github.io/