Can not use rule file - Unable to create Field Extractor

[jure]

I get this error:

ERROR: edu.isi.bmkeg.lapdf.classification.ruleBased.RuleBasedChunkClassifier - Unable to create Field Extractor for 'isMostPopularFontModifierBold' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Title' : [Rule name='Title']
Unable to create Field Extractor for 'getMostPopularFontSize' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Title' : [Rule name='Title']
Unable to create Field Extractor for 'isAlignedMiddle' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Title' : [Rule name='Title']
Unable to create Field Extractor for 'isAllCapitals' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Title' : [Rule name='Title']
Unable to create Field Extractor for 'isMostPopularFontModifierBold' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'DrugName' : [Rule name='DrugName']
Unable to create Field Extractor for 'getMostPopularFontSize' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'DrugName' : [Rule name='DrugName']
Unable to create Field Extractor for 'isAlignedMiddle' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'DrugName' : [Rule name='DrugName']
Unable to create Field Extractor for 'isAllCapitals' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'DrugName' : [Rule name='DrugName']
Unable to create Field Extractor for 'isMostPopularFontModifierBold' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subtitle' : [Rule name='Subtitle']
Unable to create Field Extractor for 'getMostPopularFontSize' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subtitle' : [Rule name='Subtitle']
Unable to create Field Extractor for 'isAlignedLeft' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subtitle' : [Rule name='Subtitle']
Unable to create Field Extractor for 'isAllCapitals' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subtitle' : [Rule name='Subtitle']
Unable to create Field Extractor for 'isMostPopularFontModifierBold' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subsubtitle' : [Rule name='Subsubtitle']
Unable to create Field Extractor for 'getMostPopularFontSize' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subsubtitle' : [Rule name='Subsubtitle']
Unable to create Field Extractor for 'isAlignedLeft' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subsubtitle' : [Rule name='Subsubtitle']
Unable to create Field Extractor for 'isAllCapitals' of '[ClassObjectType class=edu.isi.bmkeg.lapdf.features.ChunkFeatures]' in rule 'Subsubtitle' : [Rule name='Subsubtitle']

when trying to parse a PDF with this ruleset:

package edu.isi.bmkeg.pdf.classification.rules
import edu.isi.bmkeg.lapdf.features.ChunkFeatures;
import edu.isi.bmkeg.lapdf.model.ChunkBlock;

global ChunkBlock chunk;

rule "Title"
    activation-group "blockClassification"
    salience 4
    when
        ChunkFeatures(pageNumber==1)
    ChunkFeatures(isMostPopularFontModifierBold==true)
        ChunkFeatures(getMostPopularFontSize==11)
      ChunkFeatures(isAlignedMiddle==true)
    ChunkFeatures(isAllCapitals==true)
    eval(chunk.readNumberOfLine()<=3)
    then
        chunk.setType(chunk.TYPE_TITLE);
end

rule "DrugName"
  activation-group "blockClassification"
  salience 4
  when
    ChunkFeatures(pageNumber==1)
    ChunkFeatures(isMostPopularFontModifierBold==true)
    ChunkFeatures(getMostPopularFontSize==11)
    ChunkFeatures(isAlignedMiddle==true)
    ChunkFeatures(isAllCapitals==false)
    eval(chunk.readNumberOfLine()<=4)
  then
    chunk.setType(chunk.TYPE_TITLE);
end

rule "Subtitle"
    activation-group "blockClassification"
    salience 4
    when
    ChunkFeatures(isMostPopularFontModifierBold==true)
    ChunkFeatures(getMostPopularFontSize==11)
    ChunkFeatures(isAlignedLeft==true)
    ChunkFeatures(isAllCapitals==true)
    eval(chunk.isMatchingRegularExpression("^[1-9]")==true)
    then
        chunk.setType(chunk.TYPE_TITLE);
end

rule "Subsubtitle"
  activation-group "blockClassification"
  salience 4
  when
    ChunkFeatures(isMostPopularFontModifierBold==true)
    ChunkFeatures(getMostPopularFontSize==11)
    ChunkFeatures(isAlignedLeft==true)
    ChunkFeatures(isAllCapitals==false)
    eval(chunk.isMatchingRegularExpression("^[1-9]")==true)
  then
    chunk.setType(chunk.TYPE_TITLE);
end

Any idea what could possibly be going wrong? I'm using the latest 1.7.2-SNAPSHOT version.

[GullyAPCBurns]

Try this. I need to write better documentation but the basic idea is that if you use the ChunkFeatures directly, you only write the name of the attribute, not the getter function. When you use an eval statement, you have to use the getter function.

Hope this helps.

Gul

package edu.isi.bmkeg.pdf.classification.rules
import edu.isi.bmkeg.lapdf.features.ChunkFeatures;
import edu.isi.bmkeg.lapdf.model.ChunkBlock;

global ChunkBlock chunk;

rule "Title"
    activation-group "blockClassification"
    salience 4
    when
        ChunkFeatures(pageNumber==1)
        ChunkFeatures(mostPopularFontModifierBold==true)
        ChunkFeatures(mostPopularFontSize==11)
        ChunkFeatures(alignedMiddle==true)
        ChunkFeatures(allCapitals==true)
        eval(chunk.readNumberOfLine()<=3)
    then
        chunk.setType(chunk.TYPE_TITLE);
end

rule "DrugName"
  activation-group "blockClassification"
  salience 4
  when
    ChunkFeatures(pageNumber==1)
    ChunkFeatures(mostPopularFontModifierBold==true)
    ChunkFeatures(mostPopularFontSize==11)
    ChunkFeatures(alignedMiddle==true)
    ChunkFeatures(allCapitals==false)
    eval(chunk.readNumberOfLine()<=4)
  then
    chunk.setType(chunk.TYPE_TITLE);
end

rule "Subtitle"
    activation-group "blockClassification"
    salience 4
    when
    ChunkFeatures(mostPopularFontModifierBold==true)
    ChunkFeatures(mostPopularFontSize==11)
    ChunkFeatures(alignedLeft==true)
    ChunkFeatures(allCapitals==true)
    eval(chunk.isMatchingRegularExpression("^[1-9]")==true)
    then
        chunk.setType(chunk.TYPE_TITLE);
end

rule "Subsubtitle"
  activation-group "blockClassification"
  salience 4
  when
    ChunkFeatures(mostPopularFontModifierBold==true)
    ChunkFeatures(mostPopularFontSize==11)
    ChunkFeatures(alignedLeft==true)
    ChunkFeatures(allCapitals==false)
    eval(chunk.isMatchingRegularExpression("^[1-9]")==true)
  then
    chunk.setType(chunk.TYPE_TITLE);
end