Oracle API - Standard IN and OUT parameter

Hi,
I need to use the standard Oracle API to load bulk data into required table in Oracle HRMS. However, I am confuse on the IN and OUT parameter. For example the below standard Oracle API:
procedure Create_category
(p_validate in boolean default false
,p_effective_date in date
,p_business_group_id in number
,p_category in varchar2
,p_type in     varchar2
,p_description in varchar2
,p_parent_cat_usage_id in     number
,p_synchronous_flag in     varchar2
,p_online_flag in     varchar2 default null
,p_attribute_category in varchar2 default null
,p_attribute1 in varchar2 default null
,p_attribute2 in varchar2 default null
,p_attribute3 in varchar2 default null
,p_attribute4 in varchar2 default null
,p_attribute5 in varchar2 default null
,p_attribute6 in varchar2 default null
,p_attribute7 in varchar2 default null
,p_attribute8 in varchar2 default null
,p_attribute9 in varchar2 default null
,p_attribute10 in varchar2 default null
,p_attribute11 in varchar2 default null
,p_attribute12 in varchar2 default null
,p_attribute13 in varchar2 default null
,p_attribute14 in varchar2 default null
,p_attribute15 in varchar2 default null
,p_attribute16 in varchar2 default null
,p_attribute17 in varchar2 default null
,p_attribute18 in varchar2 default null
,p_attribute19 in varchar2 default null
,p_attribute20 in varchar2 default null
,p_data_source in varchar2 default null
,p_start_date_active in date
,p_end_date_active in date default null
,p_category_usage_id out nocopy number
,p_object_version_number out nocopy number
,p_comments in varchar2 default null
Appreciate clarification on the below:
1. What does the standard IN and OUT parameter mean?
2. Is there any other parameter besides IN and OUT?
My objective is to identify what are the mandatory/required/optional fields based on the API's parameters.
Thanks and Regards,
SC

Hi;
All APIs are listed in Oracle Integration Repository. I suggest check below notes:
http://irep.oracle.com/index.html
API User Notes - HTML Format [ID 236937.1]
R12.0.[3-4] : Oracle Install Base Api / Open Interface Setup Test [ID 427566.1]
Oracle Trading Community Architecture API User Notes, June 2003 [ID 241320.1]
Technical Uses of Customer Interface and TCA-API [ID 269121.1]
Pelase also check below:
Api's in EBS
Re: Api's in EBS
http://sairamgoudmalla.blogspot.com/2009/05/script-to-find-oracle-apis-for-any.html
API
Fixed Asset API
List of API
Re: List of APIs
Oracle Common Application Components API Reference Guide
download.oracle.com/docs/cd/B25284_01/current/acrobat/jta115api.pdf
List of APIs and open interface R12
Re: List of APIs and open interface R12
Regard
Helios

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