SPEL

‘SPEL’ is used to ‘Get’ a property in an expression. Strings and Conditions can refer to
properties of objects using a SPEL syntax (Simplest Possible Expression Language).
For example, this enables to build a Condition that tests if a field is displayed or not. These
expressions take the following general format:

${objectType.objectName.Property}

Internally, the SPEL expression is a cover for Oracle Forms builtins like GET_ITEM_PROPERTY,
GET_BLOCK_PROPERTY, etc. Additionally, the SPEL expressions support retrieving
Profile values, Message Dictionary text, and Local Variables.

http://johnytips.blogspot.com/2015/06/oaf-spel-binding.html

http://johnytips.blogspot.com/2015/06/oaf-el-expression-language.html

https://blogs.oracle.com/manojmadhusoodanan/entry/hiding_an_item_conditionally_through

http://apps2fusion.com/apps/oa-framework/149-spel-in-oa-framework-with-audio-visual-demo

http://apps2fusion.com/apps/oa-framework/382-spel-personalization-oa-framework

http://compultronics.blogspot.com/2013/09/spel-in-oaf.html

http://oracle.anilpassi.com/spel-in-oa-framework-with-audio-visual-demo.html

http://rpforacle.blogspot.com/2013/03/spel-in-oa-framework-persolizations.html

http://robertjungerius.blogspot.com/2010/10/using-spel-in-oa-framework-to-overcome.html

http://oracleanil.blogspot.com/2009/05/ppr.html

http://sabersurge.com/oracleappsdev/index.php?view=article&catid=34%3Aoa-framework&id=49%3Aspel-simplest-possible-expression-language&format=pdf&option=com_content

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http://oracleebsapps.blogspot.com/2012/07/how-to-add-context-dependent.html

http://robertjungerius.blogspot.com/2010/10/using-spel-in-oa-framework-to-overcome.html

http://rpforacle.blogspot.com/2013/03/spel-in-oa-framework-persolizations.html