diff --git a/parser/parser.go b/parser/parser.go
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index 0000000..aa532fe
--- /dev/null
+++ b/parser/parser.go
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+package parser
+
+import "io"
+
+// QueryAttrMap stores a mapping of parser query and an attribute which data
+// should be retrieved. Example: QueryAttrMap{"div": "class"}. Here div elements
+// should be found and the class value of each will be collected.
+type QueryAttrMap map[string]string
+
+// QueryResult stores all results parsed using the QueryAttrMap value. For preventing
+// data duplicates the values are stored in a map structure.
+type QueryResult map[string]struct{}
+
+// Parser describes a generic set of parser functions.
+type Parser interface {
+	// FindContent searches for only one element and returns its text content.
+	FindContent(r io.Reader, query string) (string, error)
+
+	// FindAttrMap searches by multiple queries and retrieves corresponding attributes
+	// of found elements. All queries and related attributes stores within QueryAttrMap.
+	// All results will be stored in QueryResult.
+	FindAttrMap(io.Reader, QueryAttrMap, QueryResult) error
+}